This document details the changes between this version, bash-2.05b-release,
and the previous version, bash-2.05b-beta2.
1. Changes to Bash
a. Fixed an off-by-one error in the function that translates job
specifications.
b. Note that we're running under Emacs and disable line editing if
$EMACS == `t'.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05b-beta2,
and the previous version, bash-2.05b-beta1.
1. Changes to Bash
a. Fixed the /= and %= arithmetic operators to catch division by zero.
b. Added putenv, setenv, unsetenv to getenv replacement for completeness.
c. Fixed a bug that could cause the -O expand_aliases invocation option
to not take effect.
d. Fixed a problem with process substitution that resulted in incorrect
behavior when the number of process substitutions in an individual
command approached 64.
2. Changes to Readline
a. Fixed a problem with backward-char-search when on a system with support
for multibyte characters when running in a locale without any multibyte
characters.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05b-beta1,
and the previous version, bash-2.05b-alpha1.
1. Changes to Bash
a. Fixed a problem when parsing a POSIX.2 character class name while
evaluating a bracket expression containing multibyte characters.
b. Changed the help text for `bind' to make it clear that any command
that may be placed in ~/.inputrc is a valid argument to `bind'.
c. Added `help' builtin entries for `((', `[[', and arithmetic for.
d. malloc updated again:
o slightly better overflow and underflow detection by putting the
chunk size at the beginning and end of the chunk and making
sure they match in free/realloc
o partial page allocated to make things page-aligned no longer
completely wasted
o block coalescing now enabled by default
o splitting and coalescing enabled for 32-byte chunks, the most
common size requested
o fixed a problem that resulted in spurious underflow messages and
aborts
o bin sizes are precomputed and stored in an array rather than
being computed at run time
o malloc will return memory blocks back to the system if the block
being freed is at the top of the heap and of sufficient size to
make it worthwhile
o malloc/free/realloc now inline memset instead of calling the
libc function; uses Duff's device for good performance
e. Check for getservent(); make the service name completion code dependent
on its presence.
f. Changed the readline callback that executes a command bound to a key
sequence to not save the executed command on the history list and to
save and restore the parsing state.
g. Changes to lib/sh/snprintf.c: fixed some bugs in the `g' and `G'
floating point format display; implemented the "'" flag character
that turns on thousands' grouping; fixed behavior on systems where
MB_CUR_MAX does not evaluate to a constant.
h. The `unset' builtin no longer returns a failure status when asked to
unset a previously-unset variable or function.
i. Changes to the build system to make it easier to cross-compile bash
for different systems.
j. Added `,' to the characters that are backslash-escaped during filename
completion, to avoid problems with complete-into-braces and RCS filenames
containing commas.
k. Some changes to the multibyte character support code to avoid many calls
to strlen().
l. Bash now correctly honors setting LANG to some value when LC_ALL does not
already have a value.
m. Fixed a bug that could cause SIGSEGV when processing nested traps with
trap handlers.
n. The `source/.' builtin now restores the positional parameters when it
returns unless they were changed using the `set' builtin during the file's
execution.
o. Fixed a bug that caused a syntax error when a command was terminated by
EOF.
2. New Features in Bash
a. There is now support for placing the long help text into separate files
installed into ${datadir}/bash. Not enabled by default; can be turned
on with `--enable-separate-helpfiles' option to configure.
b. All builtins that take operands accept a `--' pseudo-option, except
`echo'.
c. The `echo' builtin now accepts \0xxx (zero to three octal digits following
the `0') in addition to \xxx (one to three octal digits) for SUSv3/XPG6/
POSIX.1-2001 compliance.
3. Changes to Readline
a. Fixed a small problem in _rl_insert_char with multibyte characters.
b. Fixes from IBM for line wrapping problems when using multibyte characters.
c. Fixed a problem which caused the display to be messed up when the last
line of a multi-line prompt (possibly containing invisible characters)
was longer than the screen width.
d. Fixed a problem with the vi-mode `r' command that ocurred on systems with
support for multibyte characters when running in a locale without any
multibyte characters.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05b-alpha1,
and the previous version, bash-2.05a-release.
1. Changes to Bash
a. Some changes to work around inlining differences between compilers.
b. Added more prototypes for internal shell typedefs, to catch argument
passing errors when using pointers to functions.
c. The `cd' builtin now fails in posix mode when a valid directory cannot be
constructed from a relative pathname argument and the $PWD using pathname
canonicalization, and the -P option has not been supplied. Previously,
the shell would attempt to use what the user typed, leading to weird
values for $PWD and discrepancies between the value of $PWD and the
actual working directory.
d. The `cd' builtin now resets $PWD when canonicalization fails but a chdir
to the pathname passed as an argument succeeds (when not in posix mode).
e. The `fc' builtin has been fixed, as POSIX requires, to use the closest
history position in range when given an out-of-range argument.
f. The history file loading code was changed to allow lines to be saved in
the history list from the shell startup files.
g. `history -s args' now works bettern in compound commands.
h. The tilde expansion code was fixed to better recognize when it's being
invoked in an assignment context, which enables expansion after `='
and `:'.
i. Fixed the command name completion code so a slash is no longer appended
to a single match if there happens to be a directory with that name in
$PWD.
j. Fixed compound array assignment to no longer perform alias expansion, to
allow reserved words as array members, and to not produce extra output
when the `-v' option had been enabled.
k. Fixed the programmable completion code to better handle newlines in lists
of possible completions (e.g., `complete -W').
l. Removed the reserved words from the `bash-builtins' manual page.
m. Parser error reporting now attempts to do a better job of identifying the
token in error rather than doing straight textual analysis.
n. Fixes for Inf/NaN, locales, wide/multibyte characters and zero-length
arguments in the library snprintf(3) replacement.
o. `read -e' no longer does command name completion on the first word on
the line being read.
p. `select' now returns failure if the read of the user's selection fails.
q. Fixed a bug that could cause a core dump when setting $PIPESTATUS.
r. Fixes to not allocate so many job slots when the shell is running a loop
with job control enabled in a subshell of an interactive shell.
s. Fixed a bug in the trap code that caused traps to be inherited by
command substitutions in some cases.
t. Fixed a bug that could cause alias expansion to inappropriately expand
the word following the alias.
u. Fixed a bug in the `kill' builtin that mishandled negative pid arguments.
v. The parser is less lenient when parsing assignment statements where the
characters before the `=' don't comprise a valid identifier.
w. The arithmetic expression evaluation code now honors the setting of the
`-u' option when expanding variable names.
x. Fixed the arithmetic evaluation code to allow array subscripts to be
assigned (`let b[7]=42') and auto-incremented and auto-decremented
(e.g., b[7]++).
y. Reimplemented the existing prompt string date and time expansions using
strftime(3), which changed the output of \@ in some locales.
z. Fixed a bug that could cause a core dump when a special shell variable
(like RANDOM) was converted to an array with a variable assignment.
aa. Fixed a bug that would reset the handler for a signal the user had
trapped to a function that would exit the shell when setting the exit
trap in a non-interactive shell.
bb. Changed the execve(2) wrapper code to check whether or not a failing
command is a directory before looking at whether a `#!' interpreter
failed for some reason.
cc. Fixed a bug in the command printing code so it no longer inserts a `;'
after a newline, which produces a syntax error when reused as input.
dd. The code that expands $PS4 no longer inherits the `-x' flag.
ee. The bash-specific completion functions may now take advantage of the
double-TAB and M-? features of the standard readline completion
functions.
ff. The mail checking code no longer prints a message if the checked file's
size has not increased, even if the access time is less than the modification time.
gg. Rewrote the variable symbol table code: there is now a stack of
contexts, each possibly including a separate symbol table; there can
be more than one temporary environment supplied to nested invocations
of `./source'; the temporary environments no longer require so much
special-case code; shell functions now handle the temporary environment
and local variables more consistently; function scope exit is faster now
that the entire symbol table does not have to be traversed to dispose of
local variables; it is now easier to push vars from the temporary
environment to the shell's variable table in posix mode; some duplicated
code has been removed.
hh. Regularized the error message printing code; builtin_error is now called
more consistently, and common error message strings are handled by small
functions. This should make eventual message translation easier.
ii. Error messages now include the line number in a script when the shell
is not interactive.
jj. Array subscript expansion now takes place even when the array variable is
unset, so side effects will take place.
kk. Fixed a bug in the SICGHLD child-reaping code so that it won't find
jobs already marked as terminated if the OS reuses pids quickly enough.
ll. Fixed a bug that could cause a signal to not interrupt the `wait'
builtin while it was waiting for a background process to terminate.
mm. A couple of changes to make it easier for multiple shells to share history
files using `history -n', `history -r', and `history -w'.
nn. The `getopts' builtin always increments OPTIND to point to the next
option to be handled when an option is returned, whether it's valid
or not, as POSIX 1003.x-2001 requires.
oo. Changed some parts of the expansion code to avoid allocating and
immediately freeing memory without using the results for anything.
pp. The shell now keeps track of $IFS internally, updating its internal map
each time the variable is assigned a new value (or at local scope exit).
This saves thousands of hash lookups for IFS, which, while individually
cheap, add up.
qq. Rewrote the hash table code: searching and insertion are much faster now,
and it uses a better string hashing function; augmented the function
interface to simplify other parts of the code and remove duplicated code
rr. The shell now uses a simple, generic `object cache' for allocating and
caching words and word lists, which were the major users of
malloc/free.
ss. Fixed the assignment statement parsing code to allow whitespace and
newlines in subscripts when performing array element assignment.
tt. The shell now issues many fewer calls to sigprocmask and other signal
masking system calls.
uu. Fixed the `test' and conditional command file comparison operators to
work right when one file has a non-positive timestamp and the other
does not exist.
vv. Fixed some cases where the special characters '\001' and '\177' in the
values of variables or positional parameters caused incorrect expansion
results.
2. Changes to Readline
a. Fixed output of comment-begin character when listing variable values.
b. Added some default key bindings for common escape sequences produced by
HOME and END keys.
c. Fixed the mark handling code to be more emacs-compatible.
d. A bug was fixed in the code that prints possible completions to keep it
from printing empty strings in certain circumstances.
e. Change the key sequence printing code to print ESC as M\- if ESC is a
meta-prefix character -- it's easier for users to understand than \e.
f. Fixed unstifle_history() to return values that match the documentation.
g. Fixed the event loop (rl_event_hook) to handle the case where the input
file descriptor is invalidated.
h. Fixed the prompt display code to work better when the application has a
custom redisplay function.
i. Changes to make reading and writing the history file a little faster, and
to cope with huge history files without calling abort(3) from xmalloc.
j. The vi-mode `S' and `s' commands are now undone correctly.
3. New Features in Bash
a. If set, TMOUT is the default timeout for the `read' builtin.
b. `type' has two new options: `-f' suppresses shell function lookup, and
`-P' forces a $PATH search.
c. New code to handle multibyte characters.
d. `select' was changed to be more ksh-compatible, in that the menu is
reprinted each time through the loop only if REPLY is set to NULL.
The previous behavior is available as a compile-time option.
e. `complete -d' and `complete -o dirnames' now force a slash to be
appended to names which are symlinks to directories.
f. There is now a bindable edit-and-execute-command readline command,
like the vi-mode `v' command, bound to C-xC-e in emacs mode.
g. Added support for ksh93-like [:word:] character class in pattern matching.
h. The $'...' quoting construct now expands \cX to Control-X.
i. A new \D{...} prompt expansion; passes the `...' to strftime and inserts
the result into the expanded prompt.
j. The shell now performs arithmetic in the largest integer size the
machine supports (intmax_t), instead of long.
k. If a numeric argument is supplied to one of the bash globbing completion
functions, a `*' is appended to the word before expansion is attempted.
l. The bash globbing completion functions now allow completions to be listed
with double tabs or if `show-all-if-ambiguous' is set.
m. New `-o nospace' option for `complete' and `compgen' builtins; suppresses
readline's appending a space to the completed word.
n. New `here-string' redirection operator: <<< word.
o. When displaying variables, function attributes and definitions are shown
separately, allowing them to be re-used as input (attempting to re-use
the old output would result in syntax errors).
p. There is a new configuration option `--enable-mem-scramble', controls
bash malloc behavior of writing garbage characters into memory at
allocation and free time.
q. The `complete' and `compgen' builtins now have a new `-s/-A service'
option to complete on names from /etc/services.
r. `read' has a new `-u fd' option to read from a specified file descriptor.
s. Fix the completion code so that expansion errors in a directory name
don't cause a longjmp back to the command loop.
t. Fixed word completion inside command substitution to work a little more
intuitively.
u. The `printf' %q format specifier now uses $'...' quoting to print the
argument if it contains non-printing characters.
v. The `declare' and `typeset' builtins have a new `-t' option. When applied
to functions, it causes the DEBUG trap to be inherited by the named
function. Currently has no effect on variables.
w. The DEBUG trap is now run *before* simple commands, ((...)) commands,
[[...]] conditional commands, and for ((...)) loops.
x. The expansion of $LINENO inside a shell function is only relative to the
function start if the shell is interactive -- if the shell is running a
script, $LINENO expands to the line number in the script. This is as
POSIX-2001 requires.
y. The bash debugger in examples/bashdb has been modified to work with the
new DEBUG trap semantics, the command set has been made more gdb-like,
and the changes to $LINENO make debugging functions work better. Code
from Gary Vaughan.
z. New [n]<&word- and [n]>&word- redirections from ksh93 -- move fds (dup
and close).
aa. There is a new `-l' invocation option, equivalent to `--login'.
bb. The `hash' builtin has a new `-l' option to list contents in a reusable
format, and a `-d' option to remove a name from the hash table.
4. New Features in Readline
a. Support for key `subsequences': allows, e.g., ESC and ESC-a to both
be bound to readline functions. Now the arrow keys may be used in vi
insert mode.
b. When listing completions, and the number of lines displayed is more than
the screen length, readline uses an internal pager to display the results.
This is controlled by the `page-completions' variable (default on).
c. New code to handle editing and displaying multibyte characters.
d. The behavior introduced in bash-2.05a of deciding whether or not to
append a slash to a completed name that is a symlink to a directory has
been made optional, controlled by the `mark-symlinked-directories'
variable (default is the 2.05a behavior).
e. The `insert-comment' command now acts as a toggle if given a numeric
argument: if the first characters on the line don't specify a
comment, insert one; if they do, delete the comment text
f. New application-settable completion variable:
rl_completion_mark_symlink_dirs, allows an application's completion
function to temporarily override the user's preference for appending
slashes to names which are symlinks to directories.
g. New function available to application completion functions:
rl_completion_mode, to tell how the completion function was invoked
and decide which argument to supply to rl_complete_internal (to list
completions, etc.).
h. Readline now has an overwrite mode, toggled by the `overwrite-mode'
bindable command, which could be bound to `Insert'.
i. New application-settable completion variable:
rl_completion_suppress_append, inhibits appending of
rl_completion_append_character to completed words.
j. New key bindings when reading an incremental search string: ^W yanks
the currently-matched word out of the current line into the search
string; ^Y yanks the rest of the current line into the search string,
DEL or ^H deletes characters from the search string.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05a-release,
and the previous version, bash-2.05a-rc1.
1. Changes to Bash
a. Fixed the `printf' builtin so that the variable name supplied as an
argument to a %n conversion must be a valid shell identifier.
b. Improved the random number generator slightly.
c. Changes to configuration to not put -I/usr/include into $CFLAGS, since
it messes up some includes.
d. Corrected description of POSIXLY_CORRECT in man page and info manual.
e. Fixed a couple of cases of incorrect function prototypes that sneaked
through and caused compilation problems.
f. A few changes to avoid potential core dumps in the programmable completion
code.
g. Fixed a configure problem that could cause a non-existent file to show
up in LIBOBJS.
h. Fixed a configure problem that could cause siglist.o to not be built when
required.
i. Changes to the strtoimax and strtoumax replacement functions to work
around buggy compilers.
j. Fixed a problem with the snprintf replacement function that could
potentially cause a core dump.
2. Changes to Readline
a. Fixed a locale-specific problem in the vi-mode `goto mark' command.
b. Fixed Makefile to not put -I/usr/include into CFLAGS, since it can cause
include file problems.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05a-rc1,
and the previous version, bash-2.05a-beta1.
1. Changes to Bash
a. Fixed the snprintf replacement to correctly implement the `alternate form'
of the %g and %G conversions.
b. Fixed snprintf to correctly handle the optional precision with the %g and
%G conversions.
c. Fixed the arithmetic evaluation code to correct the values of `@' and `_'
when translating base-64 constants (they were backwards).
d. New library functions for formatting long and long long ints.
e. Fixed a few places where negative array subscripts could have occurred,
mostly as the result of systems using signed characters.
f. Fixed a few places that assumed a pid_t was no wider than an int.
g. Fixed the `maildir' mail checking code to work on systems where a
`struct stat' doesn't include an `st_blocks' member.
h. Fixed snprintf to make `unsigned long long' conversion formats (%llu)
work better.
i. Fixed snprintf to not print a sign when asked to do an unsigned conversion.
j. Made configure changes to avoid compiling empty source files in lib/sh.
k. New replacement functions (if necessary) for strtoull, strtoll, strtoimax,
strtoumax.
l. The `printf' builtin now handles the `ll' and `j' length modifiers
directly, since they can affect the type and width of the argument
passed to printf(3).
m. Renamed a number of the bash-specific autoconf macros in aclocal.m4 to
have more sytematic naming, with accompanying changes to configure.in.
n. Fixed snprintf to handle long doubles and the %a/%A conversions by
falling back to sprintf, as long as sprintf supports them.
o. Fixed return value from vsnprintf/snprintf to be the number of characters
that would have been printed, even if that number exceeds the buffer
size passed as an argument.
p. Bash no longer attempts to define its own versions of some ctype macros
if they are implemented as functions in libc but not as macros in
<ctype.h>.
q. Changed the variable printing code (used by `set', `export', etc.) to
not use the $'...' syntax when in posix mode, since that caused
interoperability problems with other shells (most notably with autoconf).
When not in posix mode, it uses $'...' if the string to be printed
contains non-printing characters and regular single quotes otherwise.
r. snprintf now recognizes the %F conversion.
s. Fixed a bug that could cause the wrong status to be returned by a shell
function when the shell is compiled without job control and a null
command containing a command substutition was executed in the function.
t. When in posix mode, the default value for MAILCHECK is 600.
u. Bash only initializes FUNCNAME, GROUPS, and DIRSTACK as special variables
if they're not in the initial environment.
v. If SECONDS appears in the initial environment with a valid integer value,
bash uses that as the starting value, as if an assignment had been
performed.
w. Bash no longer auto-exports HOME, PATH, SHELL, or TERM, even though it
gives them default values if they don't appear in the initial environment.
x. Bash no longer auto-exports HOSTNAME, HOSTTYPE, MACHTYPE, or OSTYPE,
even if it assigns them default values.
y. Bash no longer removes the export attribute from SSH_CLIENT or SSH2_CLIENT
if they appear in the initial environment.
z. Bash no longer attempts to discover if it's being run by sshd in order to
run the startup files. If the SSH_SOURCE_BASHRC is uncommented in
config-top.h it will attempt to do so as previously, but that's commented
out in the distributed version.
aa. Fixed a typo in the code that tests for LC_NUMERIC.
bb. The POSIXLY_CORRECT shell variable and its effects are now documented.
cc. Some changes to several of the support shell scripts included in the
definitions to try to avoid race conditions and attacks.
dd. Several changes to avoid warnings from `gcc -Wall'.
ee. Fixed a problem with the `unset' builtin that could cause incorrect
results if asked to unset a variable and an array subscript in the
same command.
ff. A few changes to the shell's temporary file creation code to avoid
potential file descriptor leaks and to prefer the system's idea of
the temporary directory to use.
gg. Fixes to build with the C alloca in lib/malloc/alloca.c if the system
requires it but the shell has been configured --without-bash-malloc.
hh. Updated the documentation to note that only interactive shells resend
SIGHUP to all jobs before exiting.
ii. Fixes to only pass unquoted tilde words to tilde_expand, rather than
rely on tilde_expand or getpwnam(3) to handle the quotes (MacOS 10.x
will remove backslashes in any login name passed to getpwnam(3)).
jj. Small change from Paul Eggert to make LINENO right in commands run with
`bash -c'.
2. New Features in Bash
a. The `printf' builtin now handles the %a and %A conversions if they're
implemented by printf(3).
b. The `printf' builtin now handles the %F conversion (just about like %f).
c. The `printf' builtin now handles the %n conversion like printf(3). The
corresponding argument is the name of a shell variable to which the
value is assigned.
3. Changes to Readline
a. Fixed a few places where negative array subscripts could have occurred.
b. Fixed the vi-mode code to use a better method to determine the bounds of
the array used to hold the marks.
c. Fixed the defines in chardefs.h to work better when chars are signed.
d. Fixed configure.in to use the new names for bash autoconf macros.
e. Readline no longer attempts to define its own versions of some ctype
macros if they are implemented as functions in libc but not as macros in
<ctype.h>.
f. Fixed a problem where rl_backward could possibly set point to before
the beginning of the line.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05a-beta1,
and the previous version, bash-2.05a-alpha1.
1. Changes to Bash
a. Fixed a bug in the evalution of arithmetic `for' statements when the
expanded expression is NULL.
b. Fixed an unassigned variable problem in the redirection printing code.
c. Added more prototypes to extern function declarations in the header
files and to static function declarations in C source files.
d. Make sure called functions have a prototype in scope, to get the arguments
and return values right instead of casting. Removed extern function
declarations from C source files that were already included in header
files.
e. Changed some function arguments to use function typedefs in general.h so
the prototypes can be checked. The only use of Function and VFunction
now is for unwind-protects.
f. More const changes to function arguments and appropriate variables.
g. Changed the mail checking support to handle `maildir'-style mail
directories.
h. Augmented the bash malloc to pass in the file and line number information
for each malloc, realloc, and free. This should result in better error
messages.
i. The `old' gnu malloc is no longer a configuration option.
j. Augmented the bash malloc with optional tracing and registering allocated
and freed memory.
k. Prompt string decoding now saves and restores the value of $? when it
expands the prompt string, so command substitutions don't change $?.
i. Array indices are now `long', since shell arithmetic is performed as long,
and the internal arrayind_t type is used consistently.
j. Some more `unsigned char *' fixes from Paul Eggert.
k. Fixed a bad call to builtin_error that could cause core dumps when making
local variables.
l. `return' may no longer be used to terminate a `select' command, for
compatibility with ksh.
m. Changed code that reads octal numbers to do a better job of detecting
overflows.
n. The time formatting code no longer uses absolute indices into a buffer,
because the buffer size changes depending on the size of a `time_t'.
o. `umask' now prints four digits when printing in octal mode, for
compatibility with other shells.
p. Lots of changes to the `printf' builtin from Paul Eggert: it handles `L'
formats and long doubles better, and internal functions have been
simpified where appropriate.
q. Some `time_t' fixes for machines were a time_t is bigger than a long.
r. Replaced some bash-specific autoconf macros with standard equivalents.
s. Improvmed the code that constructs temporary filenames to make the
generated names a bit more random.
t. Added code that checks for ascii before calling any of the is* ctype
functions.
u. Changed some places where a `char' was used as an array subscript to use
`unsigned char', since a `char' can be negative if it's signed by default.
v. Lots of changes to the `ulimit' builtin from Paul Eggert to add support
for the new POSIX-200x RLIM_SAVED_CUR and RLIM_SAVED_MAX values and
simplify the code.
w. `ulimit' now prints the description of a resource in any error message
relating to fetching or setting that resource's limits.
x. The `snprintf' replacement now computes maximum values at compile
time rather than using huge constants for things like long long.
y. Interactive shells now ignore `set -n'.
z. Changed the malloc bookkeeping information so that it's now 8 bytes
instead of 12 on most 32-bit machines (saving 4 bytes per allocation),
restoring 8-byte alignment.
aa. The malloc error reporting code now attempts to print the file and line
number of the call that caused the error.
bb. Changed the redirection error reporting code to catch EBADF errors and
report the file descriptor number rather than the file being redirected
to or from (e.g., things like `exec 4242<x' where 4242 is an out-of-range
file descriptor).
cc. `printf', `echo -e', and the $'...' code now process only two hex digits
after a `\x' escape sequence for compatibility with other shells, and
the documentation was changed to note that the octal and hex escape
sequences result in an eight-bit value rather than strict ASCII.
2. Changes to Readline
a. The completion code now attempts to do a better job of preserving the
case of the word the user typed if ignoring case in completions.
b. Readline defaults to not echoing the input and lets the terminal
initialization code enable echoing if there is a controlling terminal.
c. The key binding code now processes only two hex digits after a `\x'
escape sequence, and the documentation was changed to note that the
octal and hex escape sequences result in an eight-bit value rather
than strict ASCII.
3. New Features in Bash
a. The builtin `ulimit' now takes two new non-numeric arguments: `hard',
meaning the current hard limit, and `soft', meaning the current soft
limit, in addition to `unlimited'
b. `ulimit' now prints the option letter associated with a particular
resource when printing more than one limit.
c. `ulimit' prints `hard' or `soft' when a value is not `unlimited' but is
one of RLIM_SAVED_MAX or RLIM_SAVED_CUR, respectively.
4. New Features in Readline
a. New bindable variable `history-preserve-point'. If set, the history
code attempts to place the user at the same location on each history
line retrived with previous-history or next-history.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05a-alpha1,
and the previous version, bash-2.05-release.
1. Changes to Bash
a. Better checks in the redirection code for write errors.
b. bashbug now uses $TMPDIR, defaulting to /tmp, and uses mktemp(1) more
portably.
c. System-specific configuration changes for: Interix, OpenBSD, FreeBSD,
MacOS X.
d. Some more `const' cleanups through the code.
e. Fixed a typo in the /dev/fd redirection code, better checks for valid
numeric fds in /dev/fd.
f. Fixed many parts of the shell to handle integer overflow more gracefully
and to do more stringent checks for valid numbers.
g. Fixed mksignames to include config.h.
h. Fixed an uninitialized variable problem that could cause the shell to core
dump when replacing characters in a string.
i. New mechanism for updating the patch level when official patches are
released (patchlevel.h).
j. configure.in changed to no longer require external files _distribution and
_patchlevel.
k. Fixed non-interactive shell initialization problem when bash started as
`bash -i filename'.
l. Fixed printf builtin conversion error handling to be POSIX.2-conformant.
m. autoconf-2.52 is now used to build configure; autoconf-2.50 or newer is
required. Some of the bash-specific macros were removed, since they are
now standard.
n. Startup files and files read with source or `.' are no longer required to
be regular files.
o. Fixed core dump in builtin printf when user-supplied precision or field
width is 0.
p. Fixed builtin printf to treat a negative field width as a positive field
width with left-justification.
r. New unwind-protect implementation from Paul Eggert.
s. Fixed an inadvertently-unclosed comment in the bash completion code that
caused programmable completions to not add trailing slashes or spaces to
completions.
t. Fixed the process substitution code to cope better when stdin is closed.
v. Fixes, mostly from Paul Eggert, for a few possible buffer overflows in
the shell.
w. Fixes from Paul Eggert to avoid most of the type casts in the shell code,
and use more appropriate types for a number of variables.
x. Command substition no longer inherits the DEBUG trap.
y. Some fixes to the process substition code on machines without /dev/fd so
that named pipes are not removed inappropriately.
z. The loadable `getconf' builtin is now much more complete, and will become
part of the shell in the future.
aa. The select command no longer terminates on a `return', so it can be used
to return from an enclosing function (as ksh does it).
bb. Fixed the extended pattern matching code to behave better when presented
with incorrectly-formed patterns.
cc. Some changes were made with the intent of making cross-compilation easier.
dd. The network code (/dev/tcp and /dev/udp redirections) uses getaddrinfo(3)
if it's available, which adds support for IPv6.
ee. Subshells of login shells no longer source ~/.bash_logout when they exit.
ff. Fixes so that subshells don't exit inappropriately if the -e option has
been set.
gg. Restricted shells no longer allow functions to be exported.
hh. Changes to the pattern matching code so extended pattern matching works
on systems with deficient shared library implementations, like MacOS X.
ii. Better error messages when a script with a leading `#!interp' fails
to execute because of problems with `interp'.
jj. Fixed `compgen' to handle the `-o default' option better.
kk. Fixed the job control code to force an asynchronous process's standard
input to /dev/null only if job control is not active.
ll. Fixed a possible infinite recursion problem when `fc ""=abc' (a null
pattern) is used to re-execute a previous command.
mm. Fixed `declare [-a] var=value' to assign VALUE to element 0 if VAR is an
array variable. Similarly for `declare [-a] var[N]=value'. This is like
ksh93.
nn. Fixed a bug that caused `read -a aname' to work even if ANAME had been
declared readonly.
oo. Fixed a possible integer overflow problem when constructing names for
temporary files.
2. New Features in Bash
a. Added support for DESTDIR installation root prefix, so you can do a
`make install DESTDIR=bash-root' and do easier binary packaging.
b. Added support for builtin printf "'" flag character as per latest POSIX
drafts.
c. Support for POSIX.2 printf(1) length specifiers `j', `t', and `z' (from
ISO C99).
d. New autoconf macro, RL_LIB_READLINE_VERSION, for use by other applications
(bash doesn't use very much of what it returns).
e. `set [-+]o nolog' is recognized as required by the latest POSIX drafts,
but ignored.
f. New read-only `shopt' option: login_shell. Set to non-zero value if the
shell is a login shell.
g. New `\A' prompt string escape sequence; expands to time in 24 HH:MM format.
h. New `-A group/-g' option to complete and compgen; does group name
completion.
i. New `-t' option to `hash' to list hash values for each filename argument.
j. New [-+]O invocation option to set and unset `shopt' options at startup.
k. configure's `--with-installed-readline' option now takes an optional
`=PATH' suffix to set the root of the tree where readline is installed
to PATH.
l. The ksh-like `ERR' trap has been added. The `ERR' trap will be run
whenever the shell would have exited if the -e option were enabled.
It is not inherited by shell functions.
m. `readonly', `export', and `declare' now print variables which have been
given attributes but not set by assigning a value as just a command and
a variable name (like `export foo') when listing, as the latest POSIX
drafts require.
n. `bashbug' now requires that the subject be changed from the default.
o. configure has a new `--enable-largefile' option, like other GNU utilities.
p. `for' loops now allow empty word lists after `in', like the latest POSIX
drafts require.
3. Changes to Readline
a. More `const' and type casting fixes.
b. Changed rl_message() to use vsnprintf(3) (if available) to fix buffer
overflow problems.
c. The completion code no longer appends a `/' or ` ' to a match when
completing a symbolic link that resolves to a directory name, unless
the match does not add anything to the word being completed. This
means that a tab will complete the word up to the full name, but not
add anything, and a subsequent tab will add a slash.
d. Fixed a trivial typo that made the vi-mode `dT' command not work.
e. Fixed the tty code so that ^S and ^Q can be inserted with rl_quoted_insert.
f. Fixed the tty code so that ^V works more than once.
g. Changed the use of __P((...)) for function prototypes to PARAMS((...))
because the use of __P in typedefs conflicted g++ and glibc.
4. New Features in Readline
a. Added extern declaration for rl_get_termcap to readline.h, making it a
public function (it was always there, just not in readline.h).
b. New #defines in readline.h: RL_READLINE_VERSION, currently 0x0402,
RL_VERSION_MAJOR, currently 4, and RL_VERSION_MINOR, currently 2.
c. New readline variable: rl_readline_version, mirrors RL_READLINE_VERSION.
d. New bindable boolean readline variable: match-hidden-files. Controls
completion of files beginning with a `.' (on Unix). Enabled by default.
e. The history expansion code now allows any character to terminate a
`:first-' modifier, like csh.
f. The incremental search code remembers the last search string and uses
it if ^R^R is typed without a search string.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05-release,
and the previous version, bash-2.05-beta2.
1. Changes to Bash
a. Make sure we note that the first line of a multi-line command was not
saved in the history if the tests for HISTCONTROL succeed, but the
HISTIGNORE check fails.
b. Fixed a bug in the pattern matching code that caused `[' to be treated
as a special character inside a `[...]' bracket expression.
c. Fixed a bug in the pattern matching code that caused `]' to terminate
a bracket expression even if it was the first character after the `['
(or a leading `!' or `^').
d. Made a small change to report a more user-friendly error message if
execve(2) fails because of an error with the interpreter in a script
with a leading `#! interpreter'.
e. If the OS does not support an exec(2) magic number of `#!', make sure we
have a non-null interpreter name before attempting to execute it.
f. Fixed a bug that caused the shell process to end up in a different
process group than the controlling terminal if a job-control shell was
run with `exec' in the startup files.
g. When started in POSIX mode, either by `bash --posix', `bash -o posix', or
`sh', $SHELLOPTS includes `posix' and POSIXLY_CORRECT is set.
h. Fixed a problem that caused the `\W' prompt string escape sequence to
expand to nothing when $PWD was `//'.
i. The `bashbug' shell script no longer uses $(...) command substitution.
j. When `set' is invoked without options in POSIX mode, it no longer prints
the names and definitions of shell functions.
2. Changes to Readline
a. rl_set_paren_blink_timeout() is now documented.
b. Corrected history.3 man page: `$' is not in the default value of
history_word_delimiters.
c. If a hook function assigned to rl_event_hook sets rl_done to a non-zero
value, rl_read_key() now immediately returns '\n' (which is assumed to
be bound to accept-line).
3. New Features in Bash
a. The `>&word' redirection now works in POSIX mode as it does by default,
since POSIX.2 leaves it unspecified.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05-beta2,
and the previous version, bash-2.05-beta1.
1. Changes to Bash
a. Fixed a bug in the arithmetic evaluation code so that a^=b is supported.
b. Fixed startup so posixly_correct is retained across subshells begun to
execute scripts without a leading `#!'.
c. Fixed a bug that caused $(< file) to not work in a (...) subshell.
d. Added config support for Linux running on the IBM S390.
e. Fixed a bug that caused bash to get its input pointer out of sync when
reading commands through a pipe and running a command with standard
input redirected from a file.
f. Made a change so that command completion now makes about half as many
stat(2) calls when searching the $PATH.
g. Fixed a bug that caused variable assignments preceding `return' to not
be propagated to the shell environment in POSIX mode.
h. Fixed a bug with ${parameter[:]?word} -- tilde expansion was not performed
on `word'.
i. In POSIX mode, `break' and `continue' do not complain and return success
if called when the shell is not executing a loop.
j. Fixed `bash -o posix' to work the same as `bash --posix'.
k. Fixed a bug where variable assignments preceding `eval' or `source/.'
would not show up in the environment exported to subshells run by the
commands.
l. In POSIX mode, shells started to execute command substitutions inherit
the value of the `-e' option from their parent shell.
m. In POSIX mode, aliases are expanded even in non-interactive shells.
n. Changed some of the job control messages to display the text required by
POSIX.2 when the shell is in POSIX mode.
o. Fixed a bug in `test' that caused it to occasionally return incorrect
results when non-numeric arguments were supplied to `-t'.
2. Changes to Readline
a. Some changes were made to avoid gcc warnings with -Wall.
b. rl_get_keymap_by_name now finds keymaps case-insensitively, so
`set keymap EMACS' works.
c. The history file writing and truncation functions now return a useful
status on error.
d. Fixed a bug that could cause applications to dereference a NULL pointer
if a NULL second argument was passed to history_expand().
3. New Features in Bash
a. doc/readline.3 has been moved to the readline distribution.
4. New Features in Readline
a. New function, rl_get_screen_size (int *rows, int *columns), returns
readline's idea of the screen dimensions.
b. The timeout in rl_gather_tyi (readline keyboard input polling function)
is now settable via a function (rl_set_keyboard_input_timeout()).
c. Renamed the max_input_history variable to history_max_entries; the old
variable is maintained for backwards compatibility.
d. The list of characters that separate words for the history tokenizer is
now settable with a variable: history_word_delimiters. The default
value is as before.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05-beta1,
and the previous version, bash-2.05-alpha1.
1. Changes to Bash
a. Changes to allow shared library and object building on the GNU Hurd.
b. Fixes to the way exported functions are placed into the environment and
cached.
c. The globbing library once again respects locales when processing ranges
in bracket expressions while doing pattern matching.
d. System-specific configuration changes for: Tru 64, Interix
e. Bashbug now uses /usr/bin/editor as one of the editing alternatives, and
will use mktemp(1) or tempfile(1), if present, for temporary file creation.
f. Bash no longer performs a binary file check on a script argument that's
really a tty (like /dev/fd/0 or /dev/stdin).
g. Fixed a bug in the execution of shell scripts that caused the effects of
$BASH_ENV to be undone in some cases.
h. Fixed several bugs that made `bash [-i] /dev/stdin' not work correctly.
i. Several changes to the job control code to avoid some signal state
manipulation.
j. The Bash malloc no longer blocks signals as often, which should make it
faster.
k. Fixed a parsing bug that did not allow backslash to escape a single quote
inside a $'...' construct.
l. Fixed a bug that caused things like ${var:=$'value'} to be parsed
incorrectly. This showed up in newer versions of autoconf.
m. Fixed a bug in the bash-specific readline initialization that caused
key bindings to bash-specific function names appearing in .inputrc to
not be honored.
n. Bash now sets the file descriptor it uses to save the file descriptor
opened on a shell script to close on exec.
o. Fixed a bug in the prompt string decoding that caused it to misbehave
when presented an octal sequence of fewer than three characters.
p. Fixed the `test' builtin to return an error if `[' is supplied a single
argument that is not `]'.
q. Fixed a bug that caused subshells started to run executable shell scripts
without a leading `#!' to incorrectly inherit an argument list preceding
a shell builtin (like such a script called from a script sourced with `.',
where there were variable assignments preceding the `.' command)
r. Fixed a bug that caused changes to variables supplied in an assignment
statement preceding a shell builtin to not be honored (like a script
run with `.').
s. HOSTTYPE, OSTYPE, and MACHTYPE are set only if they do not have values
when the shell is started.
t. Fixed a bug that caused SIGINT to kill shell scripts after the script
called `wait'.
u. The `fc' builtin now tries to create its temporary files in the directory
named by $TMPDIR.
v. Bash no longer calls any Readline functions or uses any Readline variables
not declared in readline.h.
w. Fixed a bug that caused some substitutions involving $@ to not be split
correctly, especially expansions of the form ${paramterOPword}.
x. SSH2_CLIENT is now treated like SSH_CLIENT and not auto-exported if it
appears in the initial environment.
y. Fixed a couple of problems with shell scripts without a leading `#!'
being executed out of shell functions that could cause core dumps if
such a script attempted to execute `return'.
z. Fixed a problem with the `-nt' and `-ot' binary operators for the
`test/[' builtin and the `[[' conditional command that caused wrong
return values if one of the file arguments did not exist.
aa. Fixed a bug that caused non-interactive shells which had previously
executed `shopt -s expand_aliases' to fail to expand aliases in a
command like `(command) &'.
2. Changes to Readline
a. Changes to make most (but not yet all -- there is still crlf()) of the
exported readline functions declared in readline.h have an rl_ prefix.
b. More `const' changes in function arguments, mostly for completion
functions.
c. Fixed a bug in rl_forward that could cause the point to be set to before
the beginning of the line in vi mode.
d. Fixed a bug in the callback read-char interface to make it work when a
readline function pushes some input onto the input stream with
rl_execute_next (like the incremental search functions).
e. Fixed a file descriptor leak in the history file manipulation code that
was tripped when attempting to truncate a non-regular file (like
/dev/null).
f. Some existing variables are now documented and part of the public
interface (declared in readline.h): rl_explict_arg, rl_numeric_arg,
rl_editing_mode, rl_last_func.
g. Renamed rltty_set_default_bindings to rl_tty_set_default_bindings and
crlf to rl_crlf, so there are no public functions declared in readline.h
without an `rl_' prefix. The old functions still exist for backwards
compatibility.
3. New Features in Bash
a. A new loadable builtin, realpath, which canonicalizes and expands symlinks
in pathname arguments.
b. When `set' is called without options, it prints function defintions in a
way that allows them to be reused as input. This affects `declare' and
`declare -p' as well.
4. New Features in Readline
a. New application-callable function rl_set_prompt(const char *prompt):
expands its prompt string argument and sets rl_prompt to the result.
b. New application-callable function rl_set_screen_size(int rows, int cols):
public method for applications to set readline's idea of the screen
dimensions.
c. The history example program (examples/histexamp.c) is now built as one
of the examples.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05-alpha1,
and the previous version, bash-2.04-release.
1. Changes to Bash
a. A fix was made to allow newlines in compond array assignments.
b. configure now checks for real-time signals with unusable values.
c. Interactive shells no longer exit if a substitution fails because of an
unset variable within a sourced file.
d. Fixed a problem with incorrect matching of extended glob patterns when
doing pattern substitution.
e. `{' is now quoted by the completion code when it appears in a filename.
f. Fixed an error in pattern matching that caused the matcher to not
correctly skip the rest of a bracket expression after a character
matched.
g. Fixed a bug in the IFS word splitting code to make a non-whitespace IFS
character preceded by IFS whitespace part of the current delimiter rather
than generating a separate field.
h. The {!prefix@} expansion now generates separate words, analogous to $@,
when double-quoted.
i. Command substitution now ignores NUL bytes in the command output, and the
parser ignores them on input.
j. A fix was made to the job control code to prevent hanging processes when
the shell thinks background processes are running but the kernel returns
-1/ECHILD from waitpid().
k. `pwd' now prints an error message if the write fails when displaying the
current directory.
l. When in POSIX mode, the shell prints trap dispostions without a leading
`SIG' in the signal specification.
m. Fixed a parser bug that caused the current command's line count to be
messed up by a compound array assignment.
n. Fixed a bug in the unwind-protect code that caused bad behavior on machines
where ints and pointers are not the same size.
o. System-specific configure changes for: MacOS X.
p. Changes for Cygwin to translate \r\n and \r to \n and to set file
descriptors used for reading input to text mode in various places.
q. Fixed a bug that caused `!' to occasionally not be honored when in
a (...) subshell.
r. Bash no longer assumes that getcwd() will return any useful error message
in the buffer passed as an argument if the call fails.
s. The `source', `.', and `fc' builtins no longer check whether a file is
binary before reading commands from it.
t. Subshells no longer turn off job control when they exit, since that
sometimes resulted in the terminal being reset to the wrong process
group.
u. The history code no longer tries to save the second and subsequent lines
of a multi-line command if the first line was not saved.
v. The history saving code now does a better job of saving blank lines in a
multi-line command.
w. Removed a `feature' that made `ulimit' silently translate `unlimited' to
the current hard limit, which obscured some kernel error returns.
x. Fixed the grammar so that `}' is recognized as a reserved word after
another reserved word, rather than requiring a `;' or newline. This
means that constructs like
{ { echo a b c ; } }
work as expected.
y. Conditional commands ([[...]]) now perform tilde expansion on their
arguments.
z. Noted in the documentation that `set -a' will cause functions to be
exported if they are defined after `set -a' is executed.
aa. When an interactive login shell starts, if $PWD and $HOME refer to the
same directory but are not the same string, $PWD is set to $HOME.
bb. Fixed `printf' to handle invalid floating point numbers better.
cc. Temporary files are now created with random filenames, to improve security.
dd. The readline initialization code now binds the custom bash functions and
key bindings after the readline defaults are set up.
ee. Fixed the `source' builtin to no longer overwrite a shell function's
argument list, even if the sourced file changes the positional parameters.
ff. A bug fix was made in the expansion of `$*' in contexts where it should
not be split, like assignment statements.
gg. Fixed a bug in the parameter substring expansion to handle conditional
arithmetic expressions ( exp ? val1 : val2 ) without cutting the expression
off at the wrong `:'.
hh. The `<>' redirection is no longer subject to the current setting of
`noclobber', as POSIX.2 specifies.
ii. Fixed a bug in the conditional command parsing code that caused expressions
in parentheses to occasionally be parsed incorrectly.
jj. Fixed a bug in the ((...)) arithmetic command to allow do...done or
{...} to follow the )) without an intervening list terminator.
kk. `printf' now treats `\E' the same as `\e' when performing backslash escape
expansion for the `%b' format specifier.
ll. When in POSIX mode, the shell no longer searches the current directory for
a file to be sourced with `.' or `source' if `.' is not in $PATH.
mm. Interactive comments are no longer turned off when POSIX mode is disabled.
nn. The UID, EUID, HOSTNAME variables are not set if they are in the shell's
environment when it starts up.
oo. Fixed a bug in the `command' builtin so the effect of a command like
`command exec 4<file' is as if the `command' had been omitted.
pp. ${foo[@]} and ${foo[*]} now work as in ksh93 if `foo' is not an array
variable.
qq. ${#foo[X]}, where X is 0, @, or *, now work as in ksh93 if `foo' is not
an array variable.
rr. The shell's idea of an absolute pathname now takes into account a
possible drive specification on Cygwin and other Windows systems.
ss. Fixed a bug which caused incorrect parsing of some multi-character
constructs if they were split across input lines with backslash-newline
line continuation.
tt. Fixed a bug that caused restricted shell mode to be set inappropriately
when trying to execute a shell script without a leading `#!'.
uu. Shell function definitions no longer require that the body be a group
command ( {...} ), as POSIX.2 requires.
vv. The `cd' and `pwd' builtins now process symlinks in pathnames internally
and should require many fewer calls to getcwd().
ww. Fixed a bug that caused a pipeline's process group to be set incorrectly
if one of the pipeline elements contained a command substitution.
xx. Fixed a bug that caused core dumps when expanding the value of HISTIGNORE.
yy. The output of `set' is now quoted using $'...' so invisible characters are
displayed as escape sequences.
zz. Fixed the help text for `unset', since PATH and IFS may both be unset.
aaa. The shell no longer puts directory names into the command hash table.
bbb. Fixed a bug in `read' that caused it to occasionally free memory twice if
it was interrupted after reading a large amount of data.
ccc. Assignment statements that attempt to assign values to readonly variables
now cause the command to return an error status.
ddd. Fixed a bug that could cause incorrect output if a $(<file) construct was
interrupted.
eee. GROUPS and FUNCNAME now return an error status when assignment is
attempted, but may be unset (in which case they lose their special
properties). In all respects except unsetting, they are readonly.
fff. The string-to-integer conversion code now ignores trailing whitespace in
the string, even if strtol(3) does not.
ggg. The tcsh magic-space function now does a better job of inserting the
space close to where the point was before the history expansion, rather
than just appending it.
hhh. Fixed a bug which caused a file sourced from an interactive shell to
fill up the jobs table if it ran lots of jobs.
iii. Fixed a bug in the parameter pattern substitution code to avoid infinite
recursion on zero-length matches.
2. Changes to Readline
a. When setting the terminal attributes on systems using `struct termio',
readline waits for output to drain before changing the attributes.
b. A fix was made to the history word tokenization code to avoid attempts to
dereference a null pointer.
c. Readline now defaults rl_terminal_name to $TERM if the calling application
has left it unset, and tries to initialize with the resultant value.
d. Instead of calling (*rl_getc_function)() directly to get input in certain
places, readline now calls rl_read_key() consistently.
e. Fixed a bug in the completion code that allowed a backslash to quote a
single quote inside a single-quoted string.
f. rl_prompt is no longer assigned directly from the argument to readline(),
but uses memory allocated by readline. This allows constant strings to
be passed to readline without problems arising when the prompt processing
code wants to modify the string.
g. Fixed a bug that caused non-interactive history searches to return the
wrong line when performing multiple searches backward for the same string.
h. Many variables, function arguments, and function return values are now
declared `const' where appropriate, to improve behavior when linking with
C++ code.
i. The control character detection code now works better on systems where
`char' is unsigned by default.
j. The vi-mode numeric argument is now capped at 999999, just like emacs mode.
k. The Function, CPFunction, CPPFunction, and VFunction typedefs have been
replaced with a set of specific prototyped typedefs, though they are
still in the readline header files for backwards compatibility.
m. Nearly all of the (undocumented) internal global variables in the library
now have an _rl_ prefix -- there were a number that did not, like
screenheight, screenwidth, alphabetic, etc.
n. The ding() convenience function has been renamed to rl_ding(), though the
old function is still defined for backwards compatibility.
o. The completion convenience functions filename_completion_function,
username_completion_function, and completion_matches now have an rl_
prefix, though the old names are still defined for backwards compatibility.
p. The functions shared by readline and bash (linkage is satisfied from bash
when compiling with bash, and internally otherwise) now have an sh_ prefix.
q. Changed the shared library creation procedure on Linux and BSD/OS 4.x so
that the `soname' contains only the major version number rather than the
major and minor numbers.
r. Fixed a redisplay bug that occurred when the prompt spanned more than one
physical line and contained invisible characters.
3. New Features in Bash
a. Added a new `--init-file' invocation argument as a synonym for `--rcfile',
per the new GNU coding standards.
b. The /dev/tcp and /dev/udp redirections now accept service names as well as
port numbers.
c. `complete' and `compgen' now take a `-o value' option, which controls some
of the aspects of that compspec. Valid values are:
default - perform bash default completion if programmable
completion produces no matches
dirnames - perform directory name completion if programmable
completion produces no matches
filenames - tell readline that the compspec produces filenames,
so it can do things like append slashes to
directory names and suppress trailing spaces
4. New Features in Readline
a. The blink timeout for paren matching is now settable by applications.
b. _rl_executing_macro has been renamed to rl_executing_macro, which means
it's now part of the public interface.
c. Readline has a new variable, rl_readline_state, which is a bitmap that
encapsulates the current state of the library; intended for use by
callbacks and hook functions.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.04-release,
and the previous version, bash-2.04-beta5.
1. Changes to Bash
a. Better compile-time and configure-time checks for the necessity of
inet_aton().
b. A bug was fixed in the expansion of "${@:-}" when there are positional
parameters.
c. A typo was fixed in the output of `complete'.
d. The matches generated for a word by the `-W' argument to complete and
compgen are now matched against the word being completed, and only
matches are returned as the result.
e. Some fixes were made for systems which do not restart read(2) when a
signal caught by bash is received.
f. A bug was fixed which caused the umask to be set to 0 when an invalid
symbolic mode mask was parsed.
g. Fixed a bug that could cause a core dump if a SIGCHLD was received while
performing an assignment statement using command substitution.
h. Changed the word splitting function for programmable completion so cases
in which the cursor is between words are handled a bit better.
2. Changes to Readline
a. rl_funmap_names() is now documented.
3. New Features in Bash
a. The LC_NUMERIC variable is now treated specially, and used to set the
LC_NUMERIC locale category for number formatting, e.g., when `printf'
displays floating-point numbers.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.04-beta5,
and the previous version, bash-2.04-beta4.
1. Changes to Bash
a. A couple of changes were made to the Makefiles for easier building on
non-Unix systems.
b. Fixed a bug where the current prompt would be set to $PS2 at startup.
c. The shell script that tests an already-installed version was changed to
remove the directory it created its test programs in at exit.
d. Several changes were made to the code that tokenizes an input line for
the programmable completion code. Shell metacharacters will now appear
as individual words in the word list passed to the completion functions.
Some of the example completion shell functions were changed to understand
redirection operators.
e. A bug was fixed that, under obscure circumstances, could confuse the
parser when a shell function was run by the programmable completion code.
f. A bug was fixed in the ulimit builtin for systems not using getrlimit().
g. The execution code now propagates the correct exit status back to the rest
of the code if the return value of a subshell command was being inverted.
Some new test cases for inverting return values with the `!' reserved
word have been added.
h. Negative exponents in the arithmetic evaluation of v**e now return an
evaluation error.
i. A bug that caused bash to check the wrong process in a pipeline for
abnormal termination (and consequently resetting the terminal attributes)
was fixed.
j. Fixed a bug that caused $PS2 to be displayed after PROMPT_COMMAND was
executed.
2. Changes to Readline
1. Fixed a bug in a C preprocessor define that caused the keypad control
functions to be compiled out for all platforms except DJGPP.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.04-beta4,
and the previous version, bash-2.04-beta3.
1. Changes to Bash
a. A couple of changes were made to the redirection to attempt to avoid
race conditions and malicious file replacement.
2. A change was made to the string evaluation code (used for command
substitution, `eval', and the `.' builtin) to fix an obscure core
dump on alpha machines.
3. A bug that caused $LINENO to be wrong when executing arithmetic for
commands was fixed.
4. A couple of memory leaks in the programmable completion code were fixed.
5. A bug that could cause a core dump by freeing memory twice during a call
to `eval' if `set -u' had been enabled and an undefined variable was
referenced was fixed.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.04-beta3,
and the previous version, bash-2.04-beta2.
1. Changes to Bash
a. Bash should run the appropriate startup files when invoked by ssh2.
b. Fixed a bug in the parsing of conditional commands that could cause a
core dump.
c. Fixed a bug in parsing job specifications that occasionally caused
core dumps when an out-of-range job was referenced.
d. Fixed the `type' and `command' builtins to do better reporting of
commands that are not found in $PATH or the hash table.
e. Fixed a POSIX.2 compliance problem in the command builtin -- commands
are supposed to be reported as full pathnames.
f. The `echo' builtin now returns failure if a write error occurs.
g. Fixed a bug which caused the locale to not be reset correctly when
LC_ALL was unset.
h. Changed description of `getopts' in man page and reference manual to make
it clear that option characters may be characters other than letters.
i. If the shell exits while in a function, make sure that any trap on EXIT
doesn't think the function is still executing.
j. Bashbug now tries harder to find a usable editor if $EDITOR is not set,
rather than simply defaulting to `emacs'.
k. Changes to the scripts that guess and canonicalize the system type, from
the latest `automake' distribution via Debian.
l. When using named pipes for process substitution, make sure the file
descriptors opened for reading are set to non-blocking mode.
m. Fixed a bug that caused termination of pipelines that are killed by a
signal to not be reported in some cases.
n. When not in literal-history mode, shell comment lines are not added to
the history list.
o. When running in POSIX.2 mode, bash no longer performs word splitting on
the expanded value of the word supplied as the filename argument to
redirection operators.
p. The prompt string decoding code now backslash-quotes only characters that
are special within double quotes when expanding the \w and \W escape
sequences.
q. Fixed a bug in the prompt decoding code that could cause a non-interactive
shell to seg fault if `\u' was used in PS4 and the shell was in xtrace
mode.
r. Fixed a bug that caused function definitions to be printed with any
redirections that should be attached to the entire function before the
closing brace.
s. Changed the tilde expansion code for Cygwin systems to avoid creating
pathnames beginning with `//' if $HOME == `/'.
t. Fixed a couple of autoconf tests to avoid creating files with fixed names
in /tmp.
u. The `trap' and `kill' builtins now know the names of the POSIX.1b real-
time signals on systems which support them.
2. Changes to Readline
a. Fixed a problem with the single-quote quoting function that could cause
buffer overflows.
b. Fixed a bug that caused incorrect `stat characters' to be printed if
the files being completed were in the root directory and visible-stats
was enabled.
3. New Features in Bash
a. There is a new `rbash.1' manual page, from the Debian release.
b. The `--enable-usg-echo-default' option to `configure' has been renamed to
`--enable-xpg-echo-default'. The old option is still there for backwards
compatibility.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.04-beta2,
and the previous version, bash-2.04-beta1.
1. Changes to Bash
a. Fixed a bug that could cause pipes to be closed inappropriately in
some obscure cases.
b. Fixed a bug that caused creation of the exported environment to clobber
the current command string if there were any exported shell functions.
c. Some changes were made to reduce bash's memory usage.
d. Fixed a problem with programmable completion and filenames to be
completed containing quote characters.
e. Changed the code the removes named pipes created for the <(...) and >(...)
expansions to defer removal until after any current shell function has
finished executing.
f. Fixed a bug in `select' which caused it to not handle the `continue'
builtin correctly.
g. Autoconf tests added for cygwin32 and mingw32.
2. New Features in Bash
a. The `--with-bash-malloc' configure option replaces `--with-gnu-malloc'
(which is still there for backwards compatibility).
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.04-beta1,
and the previous version, bash-2.04-alpha1.
1. Changes to Bash
a. Fixed a bug in the programmable completion code that occurred when
trying to complete command lines containing a `;' or `@'.
b. The file descriptor from which the shell is reading a script is now
moved to a file descriptor above the user-addressible range.
c. Changes to `printf' so that it can handle integers beginning with 0
or 0x as octal and hex, respectively.
d. Fixes to the programmable completion code so it handles nonsense like
`compgen -C xyz' gracefully.
e. The shell no longer modifies the signal handler for SIGPROF, allowing
profiling again on certain systems.
f. The shell checks for a new window size, if the user has requested it,
after a process exits due to a signal.
g. Fixed a bug with variables with null values in a program's temporary
environment and the bash getenv() replacement.
h. `declare' and the other builtins that take variable assignments as
arguments now honor `set -a' and mark modified variables for export.
i. Some changes were made for --dump-po-strings mode when writing strings
with embedded newlines.
j. The code that caches export strings from the initial environment now
duplicates the string rather than just pointing into the environment.
k. The filename completion quoting code now uses single quotes by default
if the filename being completed contains newlines, since \<newline>
has a special meaning to the parser.
l. Bash now uses typedefs bits32_t and u_bits32_t instead of int32_t and
u_int32_t, respectively to avoid conflicts on certain Unix versions.
m. Configuration changes were made for: Rhapsody, Mac OS, FreeBSD-3.x.
n. Fixed a problem with hostname-to-ip-address translation in the
/dev/(tcp|udp)/hostname/port redirection code.
o. The texinfo manual has been reorganized slightly.
p. Filename generation (globbing) range comparisons in bracket expressions
no longer use strcoll(3) even if it is available, since it has unwanted
effects in certain locales.
q. Fixed a cosmetic problem in the source that caused the shell to not
compile if DPAREN_ARITHMETIC was not defined but ARITH_FOR_COMMAND was.
r. Fixed a bug in the here-document code tripped when the file descriptor
opened to the file containing the text of the here document was the
same as a redirector specified by the user.
s. Fixed a bug where the INVERT_RETURN flag was not being set for `pipeline'
in `time ! pipeline'.
t. Fixed a bug with the `wait' builtin which manifested itself when an
interrupt was received while the shell was waiting for asynchronous
processes in a shell script.
u. Fixed the DEBUG trap code so that it has the correct value of $?.
v. Fixed a bug in the parameter pattern substitution code that could cause
the shell to attempt to free unallocated memory if the pattern started
with `/' and an expansion error occurs.
w. Fixed a bug in the positional parameter substring code that could
cause the shell to loop freeing freed memory.
x. Fixed a bug in the positional parameter pattern substitution code so
that it correctly handles null replacement strings with a pattern
string prefixed with `%' or `#'.
y. The shell no longer attempts to import functions from the environment if
started with `-n'.
z. Fixed a bug that caused `return' in a command substitution executed in
a shell function to return from the function in a subshell and continue
execution.
aa. `hash -p /pathname/with/slashes name' is no longer allowed when the shell
is restricted.
bb. The wait* job control functions now behave better if called when there
are no unwaited-for children.
cc. Command substitution no longer unconditionally disables job control in
the subshell started to run the command.
dd. A bug was fixed that occasionally caused traps to mess up the parser
state.
ee. `bashbug' now honors user headers in the mail message it sends.
ff. A bug was fixed that caused the `:p' history modifier to not print the
history expansion if the `histverify' option was set.
2. Changes to Readline
a. Fixed a bug in the redisplay code for lines with more than 256 line
breaks.
b. A bug was fixed which caused invisible character markers to not be
stripped from the prompt string if the terminal was in no-echo mode.
c. Readline no longer tries to get the variables it needs for redisplay
from the termcap entry if the calling application has specified its
own redisplay function. Readline treats the terminal as `dumb' in
this case.
d. Fixes to the SIGWINCH code so that a multiple-line prompt with escape
sequences is redrawn correctly.
3. New Features in Bash
a. `bashbug' now accepts `--help' and `--version' options.
b. There is a new `xpg_echo' option to `shopt' that controls the behavior
of echo with respect to backslash-escaped characters at runtime.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.04-alpha1,
and the previous version, bash-2.04-devel.
1. Changes to Bash
a. Fixed a bug that could cause core dumps when performing substring
expansion.
b. Shared object configuration changes for: Solaris, OSF/1
c. The POSIX_GLOB_LIBRARY code that uses the POSIX.2 globbing facilities
for pathname expansion now understands GLOBIGNORE.
d. The code that implements `eval' was changed to save the value of the
current prompt, so an eval in a shell function called by the programmable
completion code will not change the prompt to $PS2.
e. Restored the undocumented NON_INTERACTIVE_LOGIN_SHELLS #define to
config-top.h. If this is defined, all login shells will read the
startup files, not just interactive and non-interactive started with
the `--login' option.
f. Fixed a bug that caused the expansion code to occasionally dump core if
IFS contained characters > 128.
g. Fixed a problem with the grammar so that a newline is not required
after the `))' in the new-style arithmetic for statement; a semicolon
may be used as expected.
h. Variable indirection may now reference the shell's special variables.
i. The $'...' and $"..." constructs are now added to the history correctly
if they contain newlines and command-oriented history is enabled.
j. It is now an error to try to assign a value to a function-local copy
of a readonly shell variable (declared with the `local' builtin).
2. Changes to Readline
a. The history file code now uses O_BINARY mode when reading and writing
the history file on cygwin32.
3. New Features in Bash
a. A new programmable completion facility, with two new builtin commands:
complete and compgen.
b. configure has a new option, `--enable-progcomp', to compile in the
programmable completion features (enabled by default).
c. `shopt' has a new option, `progcomp', to enable and disable programmable
completion at runtime.
d. Unsetting HOSTFILE now clears the list of hostnames used for completion.
4. New Features in Readline
a. A new variable, rl_gnu_readline_p, always 1. The intent is that an
application can verify whether or not it is linked with the `real'
readline library or some substitute.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.04-devel,
and the previous version, bash-2.03-release.
1. Changes to Bash
a. System-specific configuration and source changes for: Interix, Rhapsody
b. Fixed a bug in execute_cmd.c that resulted in a compile-time error if
JOB_CONTROL was not defined.
c. An obscure race condition in the trap code was fixed.
d. The string resulting from $'...' is now requoted to avoid any further
expansion.
e. The $'...' quoting syntax now allows backslash to escape a single quote,
for ksh-93 compatibility.
f. The $"..." quoting syntax now escapes backslashes and double quotes in
the translated string when displaying them with the --dump-po-strings
option.
g. `echo -e' no longer converts \' to '.
h. Fixes were made to the extended globbing code to handle embedded (...)
patterns better.
i. Some improvements were made to the code that unsets `nodelay' mode on
the file descriptor from which bash is reading input.
j. Some changes were made to the replacement termcap library for better
operation on MS-DOS.
k. Some changes were made to the tilde expansion code to handle backslash
as a pathname separator on MS-DOS.
l. The source has been reorganized a little bit -- there is now an `include'
subdirectory, and lib/posixheaders has been removed.
m. Improvements were made to the `read' builtin so that it makes many
fewer read(2) system calls.
n. The expansion of $- will include `c' and `s' when those options are
supplied at shell invocation.
o. Several improvments were made to the completion code: variable completion
now works better when there are unterminated expansions, command
completion understands quotes better, and completion now works in certain
unclosed $(... constructs.
p. The arithmetic expansion code was fixed to not need the value of a
variable being assigned a value (fixes the "ss=09; let ss=10" bug).
q. Some changes were made to make exported environment creation faster.
r. The html documentation will be installed into $(htmldir) if that variable
has a value when `make install' is run.
s. Fixed a bug that would cause the bashrc file to be sourced inappropriately
when bash is started by sshd.
t. The SSH_CLIENT environment variable is no longer auto-exported.
u. A bug that caused redirections with (...) subshells to be performed in
the wrong order was fixed.
v. A bug that occasionally caused inappropriate expansion of assignment
statements in compound array assignments was fixed.
w. The code that parses the words in a compound array assignment was
simplified considerably and should work better now.
x. Fixes to the non-job-control code in nojobs.c to make it POSIX.2-compliant
when a user attempts to retrieve the status of a terminated background
process.
y. Fixes to the `printf' builtin so that it doesn't try to expand all
backslash escape sequences in the format string before parsing it for
% format specifiers.
2. Changes to Readline
a. The history library tries to truncate the history file only if it is a
regular file.
b. A bug that caused _rl_dispatch to address negative array indices on
systems with signed chars was fixed.
c. rl-yank-nth-arg now leaves the history position the same as when it was
called.
d. Changes to the completion code to handle MS-DOS drive-letter:pathname
filenames.
e. Completion is now case-insensitive by default on MS-DOS.
f. Fixes to the history file manipulation code for MS-DOS.
g. Readline attempts to bind the arrow keys to appropriate defaults on MS-DOS.
h. Some fixes were made to the redisplay code for better operation on MS-DOS.
i. The quoted-insert code will now insert tty special chars like ^C.
j. A bug was fixed that caused the display code to reference memory before
the start of the prompt string.
k. More support for __EMX__ (OS/2).
l. A bug was fixed in readline's signal handling that could cause infinite
recursion in signal handlers.
m. A bug was fixed that caused the point to be less than zero when rl_forward
was given a very large numeric argument.
n. The vi-mode code now gets characters via the application-settable value
of rl_getc_function rather than calling rl_getc directly.
3. New Features in Bash
a. The history builtin has a `-d offset' option to delete the history entry
at position `offset'.
b. The prompt expansion code has two new escape sequences: \j, the number of
active jobs; and \l, the basename of the shell's tty device name.
c. The `bind' builtin has a new `-x' option to bind key sequences to shell
commands.
d. There is a new shell option, no_empty_command_completion, which, when
enabled, disables command completion when TAB is typed on an empty line.
e. The `help' builtin has a `-s' option to just print a builtin's usage
synopsys.
f. There are several new arithmetic operators: id++, id-- (variable
post-increment/decrement), ++id, --id (variabl pre-increment/decrement),
expr1 , expr2 (comma operator).
g. There is a new ksh-93 style arithmetic for command:
for ((expr1 ; expr2; expr3 )); do list; done
h. The `read' builtin has a number of new options:
-t timeout only wait timeout seconds for input
-n nchars only read nchars from input instead of a full line
-d delim read until delim rather than newline
-s don't echo input chars as they are read
i. The redirection code now handles several filenames specially:
/dev/fd/N, /dev/stdin, /dev/stdout, and /dev/stderr, whether or
not they are present in the file system.
j. The redirection code now recognizes pathnames of the form
/dev/tcp/host/port and /dev/udp/host/port, and tries to open a socket
of the appropriate type to the specified port on the specified host.
k. The ksh-93 ${!prefix*} expansion, which expands to the names of all
shell variables whose names start with prefix, has been implemented.
l. There is a new dynamic variable, FUNCNAME, which expands to the name of
a currently-executing function. Assignments to FUNCNAME have no effect.
m. The GROUPS variable is no longer readonly; assignments to it are silently
discarded. This means it can be unset.
4. New Features in Readline
a. Parentheses matching is now always compiled into readline, and enabled
or disabled when the value of the `blink-matching-paren' variable is
changed.
b. MS-DOS systems now use ~/_inputrc as the last-ditch inputrc filename.
c. MS-DOS systems now use ~/_history as the default history file.
d. history-search-{forward,backward} now leave the point at the end of the
line when the string to search for is empty, like
{reverse,forward}-search-history.
e. history-search-{forward,backward} now leave the last history line found
in the readline buffer if the second or subsequent search fails.
f. New function for use by applications: rl_on_new_line_with_prompt, used
when an application displays the prompt itself before calling readline().
g. New variable for use by applications: rl_already_prompted. An application
that displays the prompt itself before calling readline() must set this to
a non-zero value.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.03-release,
and the previous version, bash-2.03-beta2.
1. Changes to Bash
a. A file descriptor leak in the `fc' builtin was fixed.
b. A bug was fixed in the `read' builtin that caused occasional spurious
failures when using `read -e'.
c. The version code needed to use the value of the cpp variable
CONF_MACHTYPE rather than MACHTYPE.
d. A new test was added to exercise the command printing and copying code.
e. A bug was fixed that caused `time' to be recognized as a reserved word
if it was the first pattern in a `case' statement pattern list.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.03-beta2,
and the previous version, bash-2.03-beta1.
1. Changes to Bash
a. Slight additions to support/shobj-conf, mostly for the benefit of AIX 4.2.
b. config.{guess,sub} support added for the NEC SX4.
c. Changed some of the cross-compiling sections of the configure macros in
aclocal.m4 so that configure won't abort.
d. Slight changes to how the HTML versions of the bash and readline manuals
are generated.
e. Fixed conditional command printing to avoid interpreting printf `%'-escapes
in arguments to [[.
f. Don't include the bash malloc on all variants of the alpha processor.
g. Changes to configure to make --enable-profiling work on Solaris 2.x.
h. Fixed a bug that manifested itself when shell functions were called
between calls to `getopts'.
i. Fixed pattern substitution so that a bare `#'as a pattern causes the
replacement string to be prefixed to the search string, and a bare
`%' causes the replacement string to be appended to the search string.
j. Fixed a bug in the command execution code that caused child processes
to occasionally have the wrong value for $!.
2. Changes to Readline
a. Added code to the history library to catch history substitutions using
`&' without a previous history substitution or search having been
performed.
3. New Features in Bash
4. New Features in Readline
a. New bindable variable: `isearch-terminators'.
b. New bindable function: `forward-backward-delete-char' (unbound by default).
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.03-beta1,
and the previous version, bash-2.03-alpha.
1. Changes to Bash
a. A change was made to the help text for `{...}' to make it clear that a
semicolon is required before the closing brace.
b. A fix was made to the `test' builtin so that syntax errors cause test
to return an exit status > 1.
c. Globbing is no longer performed on assignment statements that appear as
arguments to `assignment builtins' such as `export'.
d. System-specific configuration changes were made for: Rhapsody,
AIX 4.2/gcc, BSD/OS 4.0.
e. New loadable builtins: ln, unlink.
f. Some fixes were made to the globbing code to handle extended glob patterns
which immediately follow a `*'.
g. A fix was made to the command printing code to ensure that redirections
following compound commands have a space separating them from the rest
of the command.
h. The pathname canonicalization code was changed to produce fewer leading
`//' sequences, since those are interpreted as network file system
pathnames on some systems.
i. A fix was made so that loops containing `eval' commands in commands passed
to `bash -c' would not exit prematurely.
j. Some changes were made to the job reaping code when the shell is not
interactive, so the shell will retain exit statuses longer for examination
by `wait'.
k. A fix was made so that `jobs | command' works again.
l. The erroneous compound array assignment var=((...)) is now a syntax error.
m. A change was made to the dynamic loading code in `enable' to support
Tenon's MachTen.
n. A fix was made to the globbing code so that extended globbing patterns
will correctly match `.' in a bracket expression.
2. Changes to Readline
a. A fix was made to the completion code in which a typo caused the wrong
value to be passed to the function that computed the longest common
prefix of the list of matches.
b. The completion code now checks the value of rl_filename_completion_desired,
which is set by application-supplied completion functions to indicate
that filename completion is being performed, to decide whether or not to
call an application-supplied `ignore completions' function.
3. New Features in Bash
a. A change was made to the startup file code so that any shell begun with
the `--login' option, even non-interactive shells, will source the login
shell startup files.
4. New Features in Readline
a. A new variable, rl_erase_empty_line, which, if set by an application using
readline, will cause readline to erase, prompt and all, lines on which the
only thing typed was a newline.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.03-alpha,
and the previous version, bash-2.02.1-release.
1. Changes to Bash
a. System-specific configuration changes were made for: Irix 6.x, Unixware 7.
b. The texi2dvi and texi2html scripts were updated to the latest versions
from the net.
c. The configure tests that determine which native type is 32 bits were
changed to not require a compiled program.
d. Fixed a bug in shell_execve that could cause memory to be freed twice
after a failed exec.
e. The `printf' test uses `diff -a' if it's available to prevent confusion
due to the non-ascii output.
f. Shared object configuration is now performed by a shell script,
support/shobj-conf, which generates values to be substituted into
makefiles by configure.
g. Some changes were made to `ulimit' to avoid the use of RLIM_INVALID as a
return value.
h. Changes were made to `ulimit' to work around HPUX 9.x's peculiar
handling of RLIMIT_FILESIZE.
i. Some new loadable builtins were added: id, printenv, sync, whoami, push,
mkdir. `pushd', `popd', and `dirs' can now be built as regular or
loadable builtins from the same source file.
j. Changes were made to `printf' to handle NUL bytes in the expanded format
string.
k. The various `make clean' Makefile targets now descend into lib/sh.
l. The `type' builtin was changed to use the internal `getopt' so that things
like `type -ap' work as expected.
m. There is a new configuration option, --with-installed-readline, to link
bash with a locally-installed version of readline. Only readline version
4.0 and later releases can support this. Shared and static libraries
are supported. The installed include files are used.
n. There is a new autoconf macro used to find which basic type is 64 bits.
o. Dynamic linking and loadable builtins should now work on SCO 3.2v5*,
AIX 4.2 with gcc, Unixware 7, and many other systems using gcc, where
the `-shared' options works correctly.
p. A bug was fixed in the bash filename completion code that caused memory to
be freed twice if a directory name containing an unset variable was
completed and the -u option was set.
q. The prompt expansion code now quotes the `$' in the `\$' expansion so it
is not processed by subsequent parameter expansion.
r. Fixed a parsing bug that caused a single or double quote after a `$$' to
trigger ANSI C expansion or locale translation.
s. Fixed a bug in the globbing code that caused quoted filenames containing
no globbing characters to sometimes be incorrectly expanded.
t. Changes to the default prompt strings if prompt string decoding is not
compiled into the shell.
u. Added `do', `then', `else', `{', and `(' to the list of keywords that may
precede the `time' reserved word.
v. The shell may now be cross-built for BeOS as well as cygwin32.
w. The conditional command execution code now treats `=' the same as `=='
for deciding when to perform pattern matching.
x. The `-e' option no longer causes the shell to exit if a command exits
with a non-zero status while running the startup files.
y. The `printf' builtin no longer dumps core if a modifier is supplied in
the format string without a conversion character (e.g. `%h').
z. Array assignments of the form a=(...) no longer show up in the history
list.
aa. The parser was fixed to obey the POSIX.2 rules for finding the closing
`}' in a ${...} expression.
bb. The history file is now opened with mode 0600 rather than 0666, so bash
no longer relies on the user's umask being set appropriately.
cc. Setting LANG no longer causes LC_ALL to be assigned a value; bash now
relies on proper behavior from the C library.
dd. Minor changes were made to allow quoted variable expansions using
${...} to be completed correctly if there is no closing `"'.
ee. Changes were made to builtins/Makefile.in so that configuring the shell
with `--enable-profiling' works right and builtins/mkbuiltins is
generated.
2. Changes to Readline
a. The version number is now 4.0.
b. There is no longer any #ifdef SHELL code in the source files.
c. Some changes were made to the key binding code to fix memory leaks and
better support Win32 systems.
d. Fixed a silly typo in the paren matching code -- it's microseconds, not
milliseconds.
e. The readline library should be compilable by C++ compilers.
f. The readline.h public header file now includes function prototypes for
all readline functions, and some changes were made to fix errors in the
source files uncovered by the use of prototypes.
g. The maximum numeric argument is now clamped at 1000000.
h. Fixes to rl_yank_last_arg to make it behave better.
i. Fixed a bug in the display code that caused core dumps if the prompt
string length exceeded 1024 characters.
j. The menu completion code was fixed to properly insert a single completion
if there is only one match.
k. A bug was fixed that caused the display code to improperly display tabs
after newlines.
3. New Features in Bash
a. New `shopt' option, `restricted_shell', indicating whether or not the
shell was started in restricted mode, for use in startup files.
b. Filename generation is now performed on the words between ( and ) in
array assignments (which it probably should have done all along).
c. OLDPWD is now auto-exported, as POSIX.2 seems to require.
d. ENV and BASH_ENV are read-only variables in a restricted shell.
4. New Features in Readline
a. Many changes to the signal handling:
o Readline now catches SIGQUIT and cleans up the tty before returning;
o A new variable, rl_catch_signals, is available to application writers
to indicate to readline whether or not it should install its own
signal handlers for SIGINT, SIGTERM, SIGQUIT, SIGALRM, SIGTSTP,
SIGTTIN, and SIGTTOU;
o A new variable, rl_catch_sigwinch, is available to application
writers to indicate to readline whether or not it should install its
own signal handler for SIGWINCH, which will chain to the calling
applications's SIGWINCH handler, if one is installed;
o There is a new function, rl_free_line_state, for application signal
handlers to call to free up the state associated with the current
line after receiving a signal;
o There is a new function, rl_cleanup_after_signal, to clean up the
display and terminal state after receiving a signal;
o There is a new function, rl_reset_after_signal, to reinitialize the
terminal and display state after an application signal handler
returns and readline continues
b. There is a new function, rl_resize_terminal, to reset readline's idea of
the screen size after a SIGWINCH.
c. New public functions: rl_save_prompt and rl_restore_prompt. These were
previously private functions with a `_' prefix.
d. New function hook: rl_pre_input_hook, called just before readline starts
reading input, after initialization.
e. New function hook: rl_display_matches_hook, called when readline would
display the list of completion matches. The new function
rl_display_match_list is what readline uses internally, and is available
for use by application functions called via this hook.
f. New bindable function, delete-char-or-list, like tcsh.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.02.1-release,
and the previous version, bash-2.02-release.
1. Changes to Bash
a. A bug that caused the bash readline support to not compile unless aliases
and csh-style history were configured into the shell was fixed.
b. Fixed a bug that could cause a core dump when here documents contained
more than 1000 characters.
c. Fixed a bug that caused a CDPATH entry of "" to not be treated the same
as the current directory when in POSIX mode.
d. Fixed an alignment problem with the memory returned by the bash malloc,
so returned memory is now 64-bit aligned.
e. Fixed a bug that caused command substitutions executed within pipelines
to put the terminal in the wrong process group.
f. Fixes to support/config.sub for: alphas, SCO Open Server and Open Desktop,
Unixware 2, and Unixware 7.
g. Fixes to the pattern matching code to make it work correctly for eight-bit
characters.
h. Fixed a problem that occasionally caused the shell to display the wrong
value for the new working directory when changing to a directory found
in $CDPATH when in physical mode.
i. Fixed a bug that caused core dumps when using conditional commands in
shell functions.
j. Fixed a bug that caused the printf builtin to loop forever if the format
string did not consume any of the arguments.
k. Fixed a bug in the parameter expansion code that caused "$@" to be
incorrectly split if $IFS did not contain a space character.
l. Fixed a bug that could cause a core dump when completing hostnames if
the number of matching hostnames was an exact multiple of 16.
m. Fixed a bug that caused the shell to fork too early when a command
such as `%2 &' was given.
2. Changes to Readline
a. Fixed a problem with redisplay that showed up when the prompt string was
longer than the screen width and the prompt contained invisible characters.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.02-release,
and the previous version, bash-2.02-beta2.
1. Changes to Bash
a. A bug was fixed that caused the terminal process group to be set
incorrectly when performing command substitution of builtins in a
pipeline.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.02-beta2,
and the previous version, bash-2.02-beta1.
1. Changes to Bash
a. Attempting to `wait' for stopped jobs now generates a warning message.
b. Pipelines which exit due to SIGPIPE in non-interactive shells are now
not reported if the shell is compiled -DDONT_REPORT_SIGPIPE.
c. Some changes were made to builtins/psize.sh and support/bashbug.sh to
attempt to avoid some /tmp file races and surreptitious file
substitutions.
d. Fixed a bug that caused the shell not to compile if configured with
dparen arithmetic but without aliases.
e. Fixed a bug that caused the input stream to be switched when assigning
empty arrays with `bash -c'.
f. A bug was fixed in the readline expansion glue code that caused bash to
dump core when expanding lines with an unclosed single quote.
g. A fix was made to the `cd' builtin so that using a non-empty directory
from $CDPATH results in an absolute pathname of the new current working
directory to be displayed after the current directory is changed.
h. Fixed a bug in the variable assignment code that caused the shell to
dump core when referencing an unset variable with `set -u' enabled in
an assignment statement preceding a command.
i. Fixed a bug in the exit trap code that caused reserved words to not be
recognized under certain circumstances.
j. Fixed a bug in the parameter pattern substitution code so that quote
removal is performed.
k. The shell should now configure correctly on Apple Rhapsody systems.
l. The `kill' builtin now prints a usage message if it is not passed any
arguments.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.02-beta1,
and the previous version, bash-2.02-alpha1.
1. Changes to Bash
a. A few compilation bugs were fixed in the new extended globbing code.
b. Executing arithmetic commands now sets the command name to `((' so
error messages look right.
c. Fixed some build problems with various configuration options.
d. The `printf' builtin now aborts immediately if an illegal format
character is encountered.
e. The code that creates here-documents now behaves better if the file it's
trying to create already exists for some reason.
f. Fixed a problem with the extended globbing code that made patterns like
`x+*' expand incorrectly.
g. The prompt string expansion code no longer quotes tildes with backslashes.
h. The bash getcwd() implementation in lib/sh/getcwd.c now behaves better in
the presence of lstat(2) failures.
i. Fixed a bug with strsub() that caused core dumps when executing `fc -s'.
j. The mail checking code now ensures that it has a valid default mailpath.
k. A bug was fixed that caused local variables to be unset inappropriately
when sourcing a script from within another sourced script.
l. A bug was fixed in the history saving code so that functions are saved
in the history list correctly if `cmdhist' is enabled, but `lithist'
is not.
m. A bug was fixed that caused printf overflows when displaying error
messages.
n. It should be easier to build the loadble builtins in examples/loadables,
though some manual editing of the generated Makefile is still required.
o. The user's primary group is now always ${GROUPS[0]}.
p. Some updates were made to support/config.guess from the GNU master copy.
q. Some changes were made to the autoconf support for Solaris 2.6 large
files.
r. The `command' builtins now does the right thing when confstr(3) cannot
find a value for _CS_PATH.
s. Extended globbing expressions like `*.!(c)' are not history expanded if
`extglob' is enabled.
t. Using the `-P' option to `cd' will force the value that is assigned to
PWD to not contain any symbolic links.
2. Changes to Readline
a. The code that prints completion listings now behaves better if one or
more of the filenames contains non-printable characters.
b. The time delay when showing matching parentheses is now 0.5 seconds.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.02-alpha1,
and the previous version, bash-2.01.1-release.
1. Changes to Bash
a. OS-specific configuration changes for: BSD/OS 3.x, Minix 2.x,
Solaris 2.6, SINIX SVR4.
b. Changes were made to the generated `info' files so that `install-info'
works correctly.
c. PWD is now auto-exported.
d. A fix was made to the pipeline code to make sure that the shell forks
to execute simple commands consisting solely of assignment statements.
e. Changes to the test suite for systems with 14-character filenames.
f. The default sizes of some internal hash tables have been made smaller
to reduce the shell's memory footprint.
g. The `((...))' arithmetic command is now executed directly instead of
being translated into `let "..."'.
h. Fixes were made to the expansion code so that "$*", "$@", "${array[@]}",
and "${array[@]}" expand correctly when IFS does not contain a space
character, is unset, or is set to NULL.
i. The indirect expansion code (${!var}) was changed so that the only
valid values of `var' are variable names, positional parameters, `#',
`@', and `*'.
j. An arithmetic expression error in a $((...)) expansion now causes a
non-interactive shell running in posix mode to exit.
k. Compound array assignment now splits the words within the parentheses
on shell metacharacters like the parser would before expansing them
and performing the assignment. This is for compatibility with ksh-93.
l. The internal shell backslash-quoting code (used in the output of `set'
and completion) now quotes tildes if they appear at the start of the
string or after a `=' or `:'.
m. A couple of bugs with `shopt -o' were fixed.
n. `bash +o' now displays the same output as `set +o' before starting an
interactive shell.
o. A bug that caused command substitution and the `eval' builtin to
occasionally free memory twice when an error was encountered was fixed.
p. The filename globbing code no longer requires read permission for a
directory when the filename to be matched does not contain any globbing
characters, as POSIX.2 specifies.
q. A bug was fixed so that the job containing the last asynchronous
process is not removed from the job table until a `wait' is executed
for that process or another asynchronous process is started. This
satisfies a POSIX.2 requirement.
r. A `select' bug was fixed so that a non-numeric user response is treated
the same as a numeric response that is out of range.
s. The shell no longer parses the value of SHELLOPTS from the environment
if it is restricted, running setuid, or running in `privileged mode'.
t. Fixes were made to enable large file support on systems such as
Solaris 2.6, where the size of a file may be larger than can be held
in an `int'.
u. The filename hashing code was fixed to not add `./' to the beginning of
filenames which already begin with `./'.
v. The configure script was changed so that the GNU termcap library is not
compiled in if `prefer-curses' has been specified.
w. HISTCONTROL and HISTIGNORE are no longer applied to the second and
subsequent lines of a multi-line command.
x. A fix was made to `disown' so that it does a better job of catching
out-of-range jobs.
y. Non-interactive shells no longer report the status of processes terminated
due to SIGINT, even if the standard output is a terminal.
z. A bug that caused the output of `jobs' to have extra carriage returns
was fixed.
aa. A bug that caused PIPESTATUS to not be set when builtins or shell
functions were executed in the foreground was fixed.
bb. Bash now attempts to detect when it is being run by sshd, and treats
that case identically to being run by rshd.
cc. A bug that caused `set -a' to export SHELLOPTS when one of the shell
options was changed was fixed.
dd. The `kill' builtin now disallows empty or missing process id arguments
instead of treating them as identical to `0', which means the current
process.
ee. `var=value declare -x var' now behaves identically to
`var=value export var'. Similarly for `var=value declare -r var' and
`var=value readonly var'.
ff. A few memory leaks were fixed.
gg. `alias' and `unalias' now print error messages when passed an argument
that is not an alias for printing or deletion, even when the shell is
not interactive, as POSIX.2 specifies.
hh. `alias' and `alias -p' now return a status of 0 when no aliases are
defined, as POSIX.2 specifes.
ii. `cd -' now prints the pathname of the new working directory if the shell
is interactive.
jj. A fix was made so that the code that binds $PWD now copes with getcwd()
returning NULL.
kk. `unset' now checks whether or not a function name it's trying to unset
is a valid shell identifier only when the shell is running in posix mode.
ll. A change was made to the code that generates filenames for here documents
to make them less prone to name collisions.
mm. The parser was changed so that `time' is recognized as a reserved word
only at the beginning of a pipeline.
nn. The pathname canonicalization code was changed so that `//' is converted
into `/', but all other pathnames beginning with `//' are left alone, as
POSIX.2 specifies.
oo. The `logout' builtin will no longer exit a non-interactive non-login
shell.
2. Changes to Readline
a. Fixed a problem in the readline test program rltest.c that caused a core
dump.
b. The code that handles parser directives in inputrc files now displays
more error messages.
c. The history expansion code was fixed so that the appearance of the
history comment character at the beginning of a word inhibits history
expansion for that word and the rest of the input line.
3. New Features in Bash
a. A new version of malloc, based on the older GNU malloc, that has many
changes, is more page-based, is more conservative with memory usage,
and does not `orphan' large blocks when they are freed.
b. A new version of gmalloc, based on the old GLIBC malloc, with many
changes and range checking included by default.
c. A new implementation of fnmatch(3) that includes full POSIX.2 Basic
Regular Expression matching, including character classes, collating
symbols, equivalence classes, and support for case-insensitive pattern
matching.
d. ksh-88 egrep-style extended pattern matching ([@+*?!](patlist)) has been
implemented, controlled by a new `shopt' option, `extglob'.
e. There is a new ksh-like `[[' compound command, which implements
extended `test' functionality.
f. There is a new `printf' builtin, implemented according to the POSIX.2
specification.
g. There is a new feature for command substitution: $(< filename) now expands
to the contents of `filename', with any trailing newlines removed
(equivalent to $(cat filename)).
h. There are new tilde prefixes which expand to directories from the
directory stack.
i. There is a new `**' arithmetic operator to do exponentiation.
j. There are new configuration options to control how bash is linked:
`--enable-profiling', to allow bash to be profiled with gprof, and
`--enable-static-link', to allow bash to be linked statically.
k. There is a new configuration option, `--enable-cond-command', which
controls whether or not the `[[' command is included. It is on by
default.
l. There is a new configuration option, `--enable-extended-glob', which
controls whether or not the ksh extended globbing feature is included.
It is enabled by default.
m. There is a new configuration #define in config.h.top that, when enabled,
will cause all login shells to source /etc/profile and one of the user-
specific login shell startup files, whether or not the shell is
interactive.
n. There is a new invocation option, `--dump-po-strings', to dump
a shell script's translatable strings ($"...") in GNU `po' format.
o. There is a new `shopt' option, `nocaseglob', to enable case-insensitive
pattern matching when globbing filenames and using the `case' construct.
p. There is a new `shopt' option, `huponexit', which, when enabled, causes
the shell to send SIGHUP to all jobs when an interactive login shell
exits.
q. `bind' has a new `-u' option, which takes a readline function name as an
argument and unbinds all key sequences bound to that function in a
specified keymap.
r. `disown' now has `-a' and `-r' options, to limit operation to all jobs
and running jobs, respectively.
s. The `shopt' `-p' option now causes output to be displayed in a reusable
format.
t. `test' has a new `-N' option, which returns true if the filename argument
has been modified since it was last accessed.
u. `umask' now has a `-p' option to print output in a reusable format.
v. A new escape sequence, `\xNNN', has been added to the `echo -e' and $'...'
translation code. It expands to the character whose ascii code is NNN
in hexadecimal.
w. The prompt string expansion code has a new `\r' escape sequence.
x. The shell may now be cross-compiled for the CYGWIN32 environment on
a Unix machine.
4. New Features in Readline
a. There is now an option for `iterative' yank-last-arg handline, so a user
can keep entering `M-.', yanking the last argument of successive history
lines.
b. New variable, `print-completions-horizontally', which causes completion
matches to be displayed across the screen (like `ls -x') rather than up
and down the screen (like `ls').
c. New variable, `completion-ignore-case', which causes filename completion
and matching to be performed case-insensitively.
d. There is a new bindable command, `magic-space', which causes history
expansion to be performed on the current readline buffer and a space to
be inserted into the result.
e. There is a new bindable command, `menu-complete', which enables tcsh-like
menu completion (successive executions of menu-complete insert a single
completion match, cycling through the list of possible completions).
f. There is a new bindable command, `paste-from-clipboard', for use on Win32
systems, to insert the text from the Win32 clipboard into the editing
buffer.
g. The key sequence translation code now understands printf-style backslash
escape sequences, including \NNN octal escapes. These escape sequences
may be used in key sequence definitions or macro values.
h. An `$include' inputrc file parser directive has been added.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.01.1-release,
and the previous version, bash-2.01-release.
1. Changes to Bash
a. The select command was fixed to check the validity of the user's
input more strenuously.
b. A bug was fixed that prevented `time' from timing commands correctly
when supplied as an argument to `bash -c'.
c. A fix was made to the mail checking code to keep from adding the same
mail file to the list of files to check multiple times when parsing
$MAILPATH.
d. Fixed an off-by-one error in the tilde expansion library.
e. When using the compound array assignment syntax, the old value of
the array is cleared before assigning the new value.
f. Fixed a bug that could cause a core dump when a trap handler was reset
to the default in the trap command associated with that signal.
g. Fixed a bug in the locale code that occurred when assigning a value
to LC_ALL.
h. A change was made to the parser so that words of the form xxx=(...)
are not considered compound assignment statements unless there are
characters before the `='.
i. A fix was made to the command tracing code to correctly quote each
word of output.
j. Some changes were made to the bash-specific autoconf tests to make them
more portable.
k. Completion of words with globbing characters now correctly quotes the
result.
l. The directory /var/spool/mail is now preferred to /usr/spool/mail when
configure is deciding on the default mail directory.
m. The brace completion code was fixed to not quote the `{' and `}'.
n. Some fixes were made to make $RANDOM more random in subshells.
o. System-specific changes were made to configure for: SVR4.2
p. Changes were made so that completion of words containing globbing chars
substitutes the result only if a single filename was matched.
q. The window size is now recomputed after a job is stopped with SIGTSTP if
the user has set `checkwinsize' with `shopt'.
r. When doing substring expansion, out-of-range substring specifiers now
cause nothing to be substituted rather than an expansion error.
s. A fix was made so that you can no longer trap `SIGEXIT' or `SIGDEBUG' --
only `EXIT' and `DEBUG' are accepted.
t. The display of trapped signals now uses the signal number if signals
for which bash does not know the name are trapped.
u. A fix was made so that `bash -r' does not turn on restricted mode until
after the startup files are executed.
v. A bug was fixed that occasionally caused a core dump when a variable
found in the temporary environment of export/declare/readonly had a
null value.
w. A bug that occasionally caused unallocated memory to be passed to free()
when doing arithmetic substitution was fixed.
x. A bug that caused a buffer overrun when expanding a prompt string
containing `\w' and ${#PWD} exceeded PATH_MAX was fixed.
y. A problem with the completion code that occasionally caused it to
refer to a character before the beginning of the readline line buffer
was fixed.
z. A bug was fixed so that the `read' builtin restarts reads when
interrupted by signals other than SIGINT.
aa. Fixed a bug that caused a command to be freed twice when there was
an evaluation error in the `eval' command.
2. Changes to Readline
a. Added a missing `extern' to a declaration in readline.h that kept
readline from compiling cleanly on some systems.
b. The history file is now opened with mode 0600 when it is written for
better security.
c. Changes were made to the SIGWINCH handling code so that prompt redisplay
is done better.
d. ^G now interrupts incremental searches correctly.
e. A bug that caused a core dump when the set of characters to be quoted
when completing words was empty was fixed.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.01-release,
and the previous version, bash-2.01-beta2.
1. Changes to Bash
a. The `distclean' target should remove the `printenv' executable if it
has been created.
b. The test suite was changed slightly to ensure that the error messages
are printed in English.
c. A bug that caused the shell to dump core when a filename containing a
`/' was passed to `hash' was fixed.
d. Pathname canonicalization now leaves a leading `//' intact, as POSIX.1
requires.
e. A memory leak when completing commands was fixed.
f. A memory leak that occurred when checking the hash table for commands
with relative paths was fixed.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.01-beta2,
and the previous version, bash-2.01-beta1.
1. Changes to Bash
a. The `ulimit' builtin translates RLIM_INFINITY to the hard limit only if
the current (soft) limit is less than or equal to the hard limit.
b. Fixed a bug that caused the bash emulation of strcasecmp to produce
incorrect results.
c. A bug that caused memory to be freed twice when a trap handler resets
the trap more than once was fixed.
d. A bug that caused machines where sizeof (pointer) > sizeof (int) to
fail (and possibly dump core) when trying to unwind-protect a null
pointer was fixed.
e. The startup files should not be run with job control enabled. This fix
allows SIGINT to once again interrupt startup file execution.
f. Bash should not change the SIGPROF handler if it is set to something
other than SIG_DFL.
g. The completion code that provides bash-specific completions for readline
now quotes characters that the readline code would treat as word break
characters if they appear in a file name.
h. The completion code now correctly quotes filenames containing a `!',
even if the user attempted to use double quotes when attempting
completion.
i. A bug that caused the shell to dump core when `disown' was called without
arguments and there was no current job was fixed.
j. A construct like $((foo);bar) is now processed as a command substitution
rather than as a bad arithmetic substitution.
k. A couple of bugs that caused `fc' to not obey the `cmdhist' and `lithist'
shell options when editing and re-executing a series of commands were
fixed.
l. A fix was made to the grammar -- the list of commands between `do' and
`done' in the body of a `for' command should be treated the same as a
while loop.
2. Changes to Readline
a. A couple of bugs that caused the history search functions to attempt to
free a NULL pointer were fixed.
b. If the C library provides setlocale(3), readline does not need to look
at various environment variables to decide whether or not to go into
eight-bit mode automatically -- just check whether the current locale
is not `C' or `POSIX'.
c. If the filename completion function finds that a directory was not closed
by a previous (interrupted) completion, it closes the directory with
closedir().
3. New Features in Bash
a. New bindable readline commands: history-and-alias-expand-line and
alias-expand-line. The code was always in there, there was just no
way to execute it.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.01-beta1,
and the previous version, bash-2.01-alpha1.
1. Changes to Bash
a. Fixed a problem that could cause file descriptors used for process
substitution to conflict with those used explicitly in redirections.
b. Made it easier to regenerate configure if the user changes configure.in.
c. ${GROUPS[0]} should always be the primary group, even on systems without
multiple groups.
d. Spelling correction is no longer enabled by default.
e. Fixes to quoting problems in `bashbug'.
f. OS-specific configuration changes were made for: Irix 6.
g. OS-specific code changes were made for: QNX.
h. A more meaningful message is now printed when the file in /tmp for a
here document cannot be created.
i. Many changes to the shell's variable initialization code to speed
non-interactive startup.
j. Changes to the non-job-control code so that it does not try to open
/dev/tty.
k. The output of `set' and `export' is once again sorted, as POSIX wants.
l. Fixed a problem caused by a recursive call reparsing the value of
$SHELLOPTS.
m. The tilde code no longer calls getenv() when it's compiled as part of
the shell, which should eliminate problems on systems that cannot
redefine getenv(), like the NeXT OS.
n. Fixed a problem that caused `bash -o' or `bash +o' to not list all
the shell options.
o. Fixed `ulimit' to convert RLIM_INFINITY to the appropriate hard limit
only if the hard limit is greater than the current (soft) limit.
p. Fixed a problem that arose when building bash in a different directory
than the source and y.tab.[ch] were remade with something other than
bison. This came up most often on NetBSD.
q. Fixed a problem with completion -- it thought that `pwd`/[TAB] indicated
an unfinished command completion (`/), which generated errors.
r. The bash special tilde expansions (~-, ~+) are now attempted before
calling the standard tilde expansion code, which should eliminate the
problems people have been seeing with this on Solaris 2.5.1.
s. Added support for <stdarg.h> to places where it was missing.
t. Changed the code that reads the output of a command substitution to not
go through stdio. This reduces the memory requirements and is faster.
u. A number of changes to speed up export environment creation were made.
v. A number of memory leaks were fixed as the result of running the test
scripts through Purify.
w. Fixed a bug that caused subshells forked to interpret executable
scripts without a leading `#!' to not reinitialize the values of
the shell options.
2. Changes to Readline
a. History library has less `#ifdef SHELL' code -- abstracted stuff out
into application-specific function hooks.
b. Readline no longer calls getenv() if it's compiled as part of the shell,
which should eliminate problems on systems that cannot redefine getenv(),
like the NeXT OS.
c. Fixed translation of ESC when `untranslating' macro values.
d. The region kill operation now fixes the mark if it ends up beyond the
boundaries of the line after the region is deleted.
3. New Features in Bash
a. New argument for `configure': `--with-curses'. This can be used to
override the selection of the termcap library on systems where it is
deficient.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.01-alpha1,
and the previous version, bash-2.0-release.
1. Changes to Bash
a. System-specific configuration changes for: FreeBSD, SunOS4, Irix,
MachTen, QNX 4.2, Harris Night Hawk, SunOS5.
b. System-specific code changes were made for: Linux, 4.4 BSD, QNX 4.2,
HP-UX, AIX 4.2.
c. A bug that caused the exec builtin to fail because the full pathname of
the command could not be found was fixed.
d. The code that performs output redirections is now more resistant to
race conditions and possible security exploits.
e. A bug that caused the shell to dump core when performing pattern
substitutions on variable values was fixed.
f. More hosts are now recognized by the auto-configuration mechanism
(OpenBSD, QNX, others).
g. Assignments to read-only variables that attempt to convert them to
arrays are now errors.
h. A bug that caused shell scripts using array assignments in POSIX mode
to exit after the assignment was performed was fixed.
i. The substring expansion code is now more careful about running off the
ends of the expanded variable value.
j. A bug that caused completion to fail if a backquoted command substitution
appeared anywhere on the line was fixed.
k. The `source' builtin no longer turns off history if it has been enabled
in a non-interactive shell.
l. A bug that caused the shell to crash when `disown' was given a pid
instead of a job number was fixed.
m. The `cd' spelling correction code will not try to change to `.' if no
directory entries match a single-character argument.
n. A bad variable name supplied to `declare', `export', or `readonly' no
longer causes a non-interactive shell in POSIX mode to exit.
o. Some fixes were made to the test suite to handle peculiarities of
various Unix versions.
p. The bash completion code now quotes characters that readline would
treat as word breaks for completion but are not shell metacharacters.
q. Bad options supplied at invocation now cause a usage message to be
displayed.
r. Fixes were made to the code that handles DEBUG traps so that the trap
string is not freed inappropriately.
s. Some changes were made to the bash debugger in examples/bashdb -- it
should be closer to working now.
t. A problem that caused the default filename used for mail checking to be
wrong was fixed.
u. A fix was made to the `echo' builtin so that NUL characters printed with
`echo -e' do not cause the output to be truncated.
v. A fix was made to the job control code so that the shell behaves better
when monitor mode is enabled in a non-interactive shell.
w. Bash no longer catches all of the terminating signals in a non-
interactive shell until a trap is set on EXIT, which should result in
quicker startup.
x. A fix was made to the command timing code so that `time' can be used in
a loop.
y. A fix was made to the parser so that `((cmd); cmd2)' is now parsed as
a nested subshell rather than strictly as an (erroneous) arithmetic
command.
z. A fix was made to the globbing code so that it correctly matches quoted
filenames beginning with a `.'.
aa. A bug in `fc' that caused some multi-line commands to not be stored as
one command in the history when they were re-executed after editing
(with `fc -e') was fixed.
bb. The `ulimit' builtin now attempts to catch some classes of integer
overflows.
cc. The command-oriented-history code no longer attempts to add `;'
inappropriately when a newline appears while reading a $(...) command
substitution.
dd. A bug that caused the shell to dump core when `help --' was executed
was fixed.
ee. A bug that caused the shell to crash when an unset variable appeared
in the body of a here document after `set -u' had been executed was
fixed.
ff. Implicit input redirections from /dev/null for asynchronous commands
are now handled better.
gg. A bug that caused the shell to fail to compile when configured with
`--disable-readline' was fixed.
hh. The globbing code should now be interruptible.
ii. Bash now notices when the `kill' builtin is used to send SIGCONT to a
stopped job and adjusts the data structures accordingly, as if `bg' had
been executed instead.
jj. A bug that caused the shell to crash when mixing calls to `getopts'
and `shift' on the same set of positional parameters was fixed.
kk. The command printing code now preserves the `-p' flag to `time'.
ll. The command printing code now handles here documents better when there
are other redirections associated with the command.
mm. The special glibc environment variable (NNN_GNU_nonoption_argv_flags_)
is no longer placed into the environment of executed commands -- users
of glibc had too many problems with it.
nn. Reorganized the code that generates signames.h. The signal_names list
is now more complete but may be slightly different (SIGABRT is favored
over SIGIOT, for example). The preferred signal names are those
listed in the POSIX.2 standard.
oo. `bashbug' now uses a filename shorter than 14 characters for its
temporary file, and asks for confirmation before sending the bug
report.
pp. A bug that caused TAB completion in vi editing mode to not be turned
off when `set -o posix' was executed or back on when `set +o posix'
was executed was fixed.
qq. A bug in the brace expansion code that caused brace expansions appearing
in new-style $(...) command substitutions to be inappropriately expanded
was fixed.
rr. A bug in the readline hook shell-expand-line that could cause memory to
be inappropriately freed was fixed.
ss. A bug that caused some arithmetic expressions containing `&&' and `||'
to be parsed with the wrong precedence has been fixed.
tt. References to unbound variables after `set -u' has been executed now
cause the shell to exit immediately, as they should.
uu. A bug that caused the shell to exit inappropriately when `set -e' had
been executed and a command's return status was being inverted with the
`!' reserved word was fixed.
vv. A bug that could occasionally cause the shell to crash with a
divide-by-zero error when timing a command was fixed.
ww. A bug that caused parameter pattern substitution to leave stray
backslashes in the replacement string when the expression is in
double quotes was fixed.
xx. The `break' and `continue' builtins now break out of all loops when an
invalid count argument is supplied.
yy. Fixed a bug that caused PATH to be set to the empty string if
`command -p' is executed with PATH unset.
zz. Fixed `kill -l signum' to print the signal name without the `SIG' prefix,
as POSIX specifies.
aaa. Fixed a bug that caused the shell to crash while setting $SHELLOPTS
if there were no shell options set.
bbb. Fixed `export -p' and `readonly -p' so that when the shell is in POSIX
mode, their output is as POSIX.2 specifies.
ccc. Fixed a bug in `readonly' so that `readonly -a avar=(...)' actually
creates an array variable.
ddd. Fixed a bug that prevented `time' from correctly timing background
pipelines.
2. Changes to Readline
a. A bug that caused an extra newline to be printed when the cursor was on
an otherwise empty line was fixed.
b. An instance of memory being used after it was freed was corrected.
c. The redisplay code now works when the prompt is longer than the screen
width.
d. `dump-macros' is now a bindable name, as it should have been all along.
e. Non-printable characters are now expanded when displaying macros and
their values.
f. The `dump-variables' and `dump-macros' commands now output a leading
newline if they're called as the result of a key sequence, rather
than directly by an application.
3. New Features in Bash
a. There is a new builtin array variable: GROUPS, the set of groups to which
the user belongs. This is used by the test suite.
4. New Features in Readline
a. If a key sequence bound to `universal-argument' is read while reading a
numeric argument started with `universal-argument', it terminates the
argument but is otherwise ignored. This provides a way to insert multiple
instances of a digit string, and is how GNU emacs does it.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.0-release,
and the previous version, bash-2.0-beta3.
1. Changes to Bash
a. Fix to the `getopts' builtin so that it does the right thing when a
required option argument is not present.
b. The completion code now updates the common prefix of matched names
after FIGNORE processing is done, since any names that were removed
may have changed the common prefix.
c. Fixed a bug that made messages in MAILPATH entries not work correctly.
d. Fixed a serious documentation error in the description of the new
${parameter:offset[:length]} expansion.
e. Fixes to make parameter substring expansion ({$param:offset[:length]})
work when within double quotes.
f. Fixes to make ^A (CTLESC) survive an unquoted expansion of positional
parameters.
g. Corrected a misspelling of `unlimited' in the output of `ulimit'.
h. Fixed a bug that caused executable scripts without a leading `#!' to
occasionally pick up the wrong set of positional parameters.
i. Linux systems now have a working `ulimit -v', using RLIMIT_AS.
j. Updated config.guess so that many more machine types are recognized.
k. Fixed a bug with backslash-quoted slashes in the ${param/pat[/sub]}
expansion.
l. If the shell is named `-su', and `-c command' is supplied, read and
execute the login shell startup files even though the shell is not
interactive. This is to support the `-' option to `su'.
m. Fixed a bug that caused core dumps when the DEBUG trap was ignored
with `trap "" DEBUG' and a shell function was subsequently executed.
n. Fixed a bug that caused core dumps in the read builtin when IFS was
set to the null string and the input had leading whitespace.
2. Changes to Readline
a. Fixed a bug that caused a numeric argument of 1024 to be ignored when
inserting text.
b. Fixed the display code so that the numeric argument is displayed as it's
being entered.
c. Fixed the numeric argument reading code so that `M-- command' is
equivalent to `M--1 command', as the prompt implies.
3. New Features in Bash
a. `ulimit' now sets both hard and soft limits and reports the soft limit
by default (when neither -H nor -S is specified). This is compatible
with versions of sh and ksh that implement `ulimit'.
b. Integer constants have been extended to base 64.
4. New Features in Readline
a. The `home' and `end' keys are now bound to beginning-of-line and
end-of-line, respectively, if the corresponding termcap capabilities
are present.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.0-beta3,
and the previous version, bash-2.0-beta2.
1. Changes to Bash
a. System-specific changes for: AIX 4.2, SCO 3.2v[45], HP-UX.
b. When in POSIX mode, variable assignments preceding a special builtin
persist in the shell environment after the builtin completes.
c. Changed all calls to getwd() to getcwd(). Improved check for systems
where the libc getcwd() calls popen(), since that breaks on some
systems when job control is being used.
d. Fixed a bug that caused seg faults when executing scripts with the
execute bit set but without a leading `#!'.
e. The environment passed to executed commands is never sorted.
f. A bug was fixed in the code that expands ${name[@]} to the number of
elements in an array variable.
g. A bug was fixed in the array compound assignment code ( A=( ... ) ).
h. Window size changes now correctly propagate down to readline if
the shopt `checkwinsize' option is enabled.
i. A fix was made in the code that expands to the length of a variable
value (${#var}).
j. A fix was made to the command builtin so that it did not turn on the
`no fork' flag inappropriately.
k. A fix was made to make `set -n' work more reliably.
l. A fix was made to the job control initialization code so that the
terminal process group is set to the shell's process group if the
shell changes its own process group.
2. Changes to Readline
a. System-specific changes for: SCO 3.2v[45].
b. The behavior of the vi-mode `.' when redoing an `i' command was changed
to insert the text previously inserted by the `i' command rather than
simply entering insert mode.
3. New features in Bash
a. There is a new version of the autoload function package, in
examples/functions/autoload.v2, that uses arrays and provides more
functionality.
b. Support for LC_COLLATE and locale-specific sorting of the results of
pathname expansion if strcoll() is available.
4. New Features in Readline
a. Support for locale-specific sorting of completion possibilities if
strcoll() is available.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.0-beta2,
and the previous version, bash-2.0-beta1.
1. Changes to Bash
a. `pushd -' is once again equivalent to `pushd $OLDPWD'.
b. OS-specific changes for: SCO 3.2v[45].
c. A change was made to the fix for the recently-reported security hole
when reading characters with octal value 255 to make it work better on
systems with restartable system calls when not using readline.
d. Some changes were made to the test suite so that it works if you
configure bash with --enable-usg-echo-default.
e. A fix was made to the parsing of conditional arithmetic expressions.
f. Illegal arithmetic bases now cause an arithmetic evaluation error rather
than being silently reset.
g. Multiple arithmetic bases now cause an arithmetic evaluation error
instead of being ignored.
h. A fix was made to the evaluation of ${param?word} to conform to POSIX.2.
i. A bug that sometimes caused array indices to be evaluated twice (which
would cause errors when they contained assignment statements) was fixed.
j. `ulimit' was rewritten to avoid problems with getrlimit(2) returning
unsigned values and to simplify the code.
k. A bug in the command-oriented-history code that caused it to sometimes
put semicolons after right parens inappropriately was fixed.
l. The values inserted into the prompt by the \w and \W escape sequences
are now quoted to prevent further expansion.
m. An interactive shell invoked as `sh' now reads and executes commands
from the file named by $ENV when it starts up. If it's a login shell,
it does this after reading /etc/profile and ~/.profile.
n. The file named by $ENV is never read by non-interactive shells.
2. Changes to Readline
a. A few changes were made to hide some macros and functions that should not
be public.
b. An off-by-one error that caused seg faults in the history expansion code
was fixed.
3. New Features in Bash
a. The ksh-style ((...)) arithmetic command was implemented. It is exactly
identical to let "...". This is controlled by a new option to configure,
`--enable-dparen-arithmetic', which is on by default.
b. There is a new #define available in config.h.top: SYS_BASH_LOGOUT. If
defined to a filename, bash reads and executes commands from that file
when a login shell exits. It's commented out by default.
c. `ulimit' has a `-l' option that reports the maximum amount of data that
may be locked into memory on 4.4BSD-based systems.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.0-beta1,
and the previous version, bash-2.0-alpha4.
1. Changes to Bash
a. A bug that sometimes caused traps to be ignored on signals the
shell treats specially was fixed.
b. The internationalization code was changed to track the values of
LC_* variables and call setlocale() as appropriate. The TEXTDOMAIN
and TEXTDOMAINDIR variables are also tracked; changes cause calls
to textdomain() and bindtextdomain(), if available.
c. A bug was fixed that sometimes caused double-quoted strings to be
parsed incorrectly.
d. Changes were made so that the siglist code compiles correctly on
Solaris 2.5.
e. Added `:' to the set of characters that cause word breaks for the
completion code so that pathnames in assignments to $PATH can be
completed.
f. The `select' command was fixed to print $PS3 to stderr.
g. Fixed an error in the manual page section describing the effect that
setting and unsetting GLOBIGNORE has on the setting of the `dotglob'
option.
h. The time conversion code now uses CLK_TCK rather than CLOCKS_PER_SEC
on systems without gettimeofday() and resources.
i. The getopt static variables are now initialized each time a subshell
is started, so subshells using `getopts' work right.
j. A sign-extension bug that caused a possible security hole was fixed.
k. The parser now reads characters between backquotes within a double-
quoted string as a single word, so double quotes in the backquoted
string don't terminate the enclosing double-quoted string.
l. A bug that caused `^O' to work incorrectly when typed as the first
thing to an interactive shell was fixed.
m. A rarely-exercised off-by-one error in the code that quotes variable
values was fixed.
n. Some memory and file descriptor leaks encountered when running a
shell script that is executable but does not have a leading `#!'
were plugged.
2. Changes to Readline
a. A bug that sometimes caused incorrect results when trying to read
typeahead on systems without FIONREAD was fixed.
3. New Features in Bash
a. The command timing code now uses the value of the TIMEFORMAT variable
to format and display timing statistics.
b. The `time' reserved word now accepts a `-p' option to force the
POSIX.2 output format.
c. There are a couple of new and updated scripts to convert csh startup
files to bash format.
d. There is a new builtin array variable: BASH_VERSINFO. The various
members hold the parts of the version information in BASH_VERSION,
plus the value of MACHTYPE.
4. New Features in Readline
a. Setting LANG to `en_US.ISO8859-1' now causes readline to enter
eight-bit mode.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.0-alpha4,
and the previous version, bash-2.0-alpha3.
1. Changes to Bash
a. There is better detection of rsh connections on Solaris 2.
b. Assignments to read-only variables preceding a command name are now
variable assignment errors. Variable assignment errors cause
non-interactive shells running in posix mode to exit.
c. The word tokenizer was rewritten to handle nested quotes and pairs
('', "", ``, ${...}, $(...), $[...], $'...', $"...", <(...), >(...))
correctly. Some of the parameter expansion code was updated as a
consequence.
d. A fix was made to `test' when given three arguments so that a binary
operator is checked for first, before checking that the first argument
is `!'.
e. 2''>/dev/null is no longer equivalent to 2>/dev/null.
f. Parser error messages were regularized, and in most cases the name of
the shell script being read by a non-interactive shell is not printed
twice.
g. A fix was made to the completion code so that it no longer removes the
text the user typed in some cases.
h. The special glibc `getopt' environment variable is no longer put into
the environment on machines with small values of ARG_MAX.
i. The expansion of ${...} now follows the POSIX.2 rules for finding the
closing `}'.
j. The shell no longer displays spurious status messages for background
jobs in shell scripts that complete successfully when the script is
run from a terminal.
k. `shopt -o' now correctly updates $SHELLOPTS.
l. A bug that caused the $PATH searching code to return a non-executable
file even when an executable file with the same name appeared later in
$PATH was fixed.
m. The shell now does tilde expansions on unquoted `:~' in assignment
statements when not in posix mode.
n. Variable assignment errors when a command consists only of assignments
now cause non-interactive shells to exit when in posix mode.
o. If the variable in a `for' or `select' command is read-only, or not a
legal shell identifier, a variable assignment error occurs.
p. `test' now handles `-a' and `-o' as binary operators when three arguments
are supplied, and correctly parses `( word )' as equivalent to `word'.
q. `test' was fixed so that file names of the form /dev/fd/NN mean the same
thing on all systems, even Linux.
r. Fixed a bug in the globbing code that caused patterns with multiple
consecutive `*'s to not be matched correctly.
s. Fixed a bug that caused $PS2 to not be printed when an interactive shell
not using readline is reading a here document.
t. Fixed a bug that caused history expansion to be performed inappropriately
when a single-quoted string spanned more than one line.
u. `getopts' now checks that the variable name passed by the user as the
second argument is a legal shell identifier and that the variable is
not read-only.
v. Fixed `getopts' to obey POSIX.2 rules for setting $OPTIND when it
encounters an error.
w. Fixed `set' to display variable values in a form that can be re-read.
x. Fixed a bug in the code that keeps track of whether or not local variables
have been declared at the current level of function nesting.
y. Non-interactive shells in posix mode now exit if the name in a function
declaration is not a legal identifier.
z. The job control code now ignores stopped children when the shell is not
interactive.
aa. The `cd' builtin no longer attempts spelling correction on the directory
name if the shell is not interactive, regardless of the setting of the
`cdspell' option.
bb. Some OS-specific changes were made for SCO 3.2v[45] and AIX 4.2.
cc. `time' now prints its output to stderr, as POSIX.2 specifies.
2. Fixes to Readline
a. After printing possible completions, all lines of a multi-line prompt
are redisplayed.
b. Some changes were made to the terminal handling code in rltty.c to
work around AIX 4.2 bugs.
3. New Features in Bash
a. There is a new loadable builtin: sprintf, with calling syntax
sprintf var format [args]
This provides an easy way to simulate ksh left- and right-justified
variable values.
b. The expansions of \h and \H in prompt strings were swapped. \h now
expands to the hostname up to the first `.', as in bash-1.14.
4. New Features in Readline
a. The bash-1.14 behavior when ^M is typed while doing an incremental
search was restored. ^J may now be used to terminate the search without
accepting the line.
b. There is a new bindable variable: disable-completion. This inhibits
word completion and causes the completion character to be inserted as
if it had been bound to self-insert.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.0-alpha3,
and the previous version, bash-2.0-alpha2.
There is now a file `COMPAT' included in the distribution that lists the
user-visible incompatibilities between 1.14 and 2.0.
1. Changes to Bash
a. Some work was done so that word splitting of the rhs of assignment
statements conforms more closely to historical practice.
b. A couple of errant memory frees were fixed.
c. A fix was made to the test builtin so it recognizes `<' and `>' as
binary operators.
d. The GNU malloc in lib/malloc/malloc.c now scrambles memory as it's
allocated and freed. This is to catch callers that refer to freed
memory or assume something about newly-allocated memory.
e. Fixed a problem with conversion to 12-hour time in the prompt
expansion code.
f. Fixed a problem with configure's argument parsing order. Now you can
correctly turn on specific options after using --enable-minimal-config.
g. The configure script now automatically disables the use of GNU malloc
on systems where it's appropriate (better than having people read the
NOTES file and do it manually).
h. There are new prompt expansions (\v and \V) to insert version information
into the prompt strings.
i. The default prompt string now includes the version number.
j. Most of the builtins that take no options were changed to use the
internal getopt so they can produce proper error messages for -?
and incorrect options.
k. Some system-specific changes were made for SVR4.2 and Solaris 2.5.
l. Bash now uses PATH_MAX instead of MAXPATHLEN and NAME_MAX instead of
MAXNAMLEN.
m. A couple of problems caused by uninitialized variables were fixed.
n. There are a number of new loadable builtin examples: logname, basename,
dirname, tty, pathchk, tee, head, and rmdir. All of these conform to
POSIX.2.
o. Bash now notices changes in TZ and calls tzset() if present, so
changing TZ will alter the time printed by prompt expansions.
p. The source was reorganized a bit so I don't have to wait so long for
some files to compile, and to facilitate the creation of a `shell
library' at some future point.
q. Bash no longer turns off job control if called as `sh', since the
POSIX.2 spec includes job control as a standard feature.
r. `bash -o posix' now works as intended.
s. Fixed a problem with the completion code: when completing a filename
that contained globbing characters, if show-all-if-ambiguous was set,
the completion code would remove the user's text.
t. Fixed ulimit so that (hopefully) the full range of limits is available
on HPUX systems.
u. A new `shopt' option (`hostcomplete') enables and disables hostname
completion.
v. The shell no longer attempts to save the history on an abort(),
which is usually called by programming_error().
w. The `-s' option to `fc' was changed to echo the command to be executed
to stderr instead of stdout.
x. If the editor invoked by `fc -e' exits with a non-zero status, no
commands are executed.
y. Fixed a bug that made the shopt `histverify' option work incorrectly.
z. There is a new variable `MACHTYPE' whose value is the GNU-style
`cpu-company-system' system description as set by configure. (The
values of MACHTYPE and HOSTTYPE should really be swapped.)
aa. The `ulimit' builtin now allows the maximum virtual memory size to be
set via setrlimit(2) if RLIMIT_VMEM is defined.
bb. `bash -nc 'command'' no longer runs `command'.
2. Changes to Readline
a. Fixed a typo in the code that checked for FIONREAD in input.c.
b. Fixed a bug in the code that outputs keybindings, so things like C-\
are quoted properly.
c. Fixed a bug in the inputrc file parsing code to handle the problems
caused by inputrc files created from the output of `bind -p' in
previous versions of bash. The problem was due to the bug fixed
in item b above.
d. Readline no longer turns off the terminal's meta key, and turns it on
once the first time it's called.
------------------------------------------------------------------------------
This file documents the changes between this version, bash-2.0-alpha2,
and the previous version, bash-2.0-alpha.
1. Changes to Bash
a. The shell no longer thinks directories are executable.
b. `disown' has a new option, `h', which inhibits the resending of SIGHUP
but does not remove the job from the jobs table.
c. The varargs functions in error.c now use ANSI-C `stdarg' if available.
d. The build process now treats the `build version' in .build as local to
the build directory, so different versions built from the same source
tree have different `build versions'.
e. Some problems with the grammar have been fixed. (It used `list' in a few
productions where `compound_list' was needed. A `list' must be terminated
with a newline or semicolon; a `compound_list' need not be.)
f. A fix was made to keep `wait' from hanging when waiting for all background
jobs.
g. `bash --help' now writes its output to stdout, like the GNU Coding Standards
specify, and includes the machine type (the value of MACHTYPE).
h. `bash --version' now prints more information and exits successfully, like
the GNU Coding Standards specify.
i. The output of `time' and `times' now prints fractional seconds with three
places after the decimal point.
j. A bug that caused process substitutions to screw up the pipeline printed
by `jobs' was fixed.
k. Fixes were made to the code that implements $'...' and $"..." so they
work as documented.
l. The process substitution code now opens named pipes for reading with
O_NONBLOCK to avoid hanging.
m. Fixes were made to the trap code so the shell cleans up correctly if the
trap command contains a `return' and we're executing a function or
sourcing a script with `.'.
n. Fixes to doc/Makefile.in so that it doesn't try to remake all of the
documentation (ps, dvi, etc.) on a `make install'.
o. Fixed an auto-increment error that caused bash -c args to sometimes dump
core.
p. Fixed a bug that caused $HISTIGNORE to fail when the history line
contained globbing characters.
2. Changes to Readline
a. There is a new string variable, rl_library_version, available for use by
applications. The current value is "2.1".
b. A bug encountered when expand-tilde was enabled and file completion was
attempted on a word beginning with `~/' was fixed.
c. A slight change was made to the incremental search termination behavior.
ESC still terminates the search, but if input is pending or arrives
within 0.1 seconds (on systems with select(2)), it is used as a prefix
character. This is intented to allow users to terminate searches with
the arrow keys and get the behavior they expect.