.sp 3 .tl ''Ksh Features That Are Obsolete in Ksh93'' .sp 2 .AL 1 .LI Using a pair of grave accents \^\fB\(ga\fR ... \fB\(ga\fR\^ for command substition. Use \fB$(\fR ... \fB)\fR instead. .LI .B FCEDIT is an obsolete name for the default editor name for the .B hist command. .B FCEDIT is not used when .B HISTEDIT is set. Use .B HISTEDIT instead. .LI The newtest (\fB[[\fR ... \fB]]\fR) operator \fB\-a\fP \fIfile\fP is obsolete. Use \fB\-e\fP instead. .LI The newtest (\fB[[\fR ... \fB]]\fR) operator .BR = , as used in \fIstring\fP \fB=\fP \fIpattern\fP is obsolete. Use \fB==\fP instead. .LI The following obsolete arithmetic comparisons are also permitted: .in +5 .VL 20 .LI "\fIexp1\fP \fB\-eq\fP \fIexp2\fP" True, if .I exp1 is equal to .IR exp2 . .LI "\fIexp1\fP \fB\-ne\fP \fIexp2\fP" True, if .I exp1 is not equal to .IR exp2 . .LI "\fIexp1\fP \fB\-lt\fP \fIexp2\fP" True, if .I exp1 is less than .IR exp2 . .LI "\fIexp1\fP \fB\-gt\fP \fIexp2\fP" True, if .I exp1 is greater than .IR exp2 . .LI "\fIexp1\fP \fB\-le\fP \fIexp2\fP" True, if .I exp1 is less than or equal to .IR exp2 . .LI "\fIexp1\fP \fB\-ge\fP \fIexp2\fP" True, if .I exp1 is greater than or equal to .IR exp2 . .LE \" End .VL .in -5 .LI Using test -t or [ -t ] without specifying the file unit number. .LI The .B \-k option to the \fBset\fR builtin is obsolete. It causes .I all\^ variable assignment arguments are placed in the environment, even if they occur after the command name. The following first prints .B "a=b c" and then .BR c : There is no alternative. .LI The obsolete .B \-xf option of the .B typeset command allows a function to be exported to scripts that are executed without a separate invocation of the shell. Functions that need to be defined across separate invocations of the shell should be placed in a directory and the .B FPATH variable should contains the name of this directory. They may also be specified in the .B ENV file with the .B \-xf option of .BR typeset . .LI The shell environment variable .B FCEDIT is obsolete. Use .B HISTEDIT instead. .LI In the .B \-s option (to \fBfc\fR or \fBhist\fR command???) ( and in obsolete versions, the editor name .B \- ) is used to skip the editing phase and to re-execute the command. .LI The .B \-t option to \fBalias\fR builtin is is obsolete. It is used to set and list tracked aliases. There is no replacement. .LI The shell command line option .B \-t is obsolete. This option cause the shell to exit after reading and executing one command. The is no replacement (although ending \&"command" with the exit builtin should have the same effect). .LI As an obsolete feature of the "set" builtin, if the first .I arg\^ is .B \- then the .B \-x and .B \-v options are turned off and the next .I arg is treated as the first argument. Using .B \+ rather than .B \- causes these options to be turned off. These options can also be used upon invocation of the shell. .LE