crontab.1   [plain text]

.\"/* Copyright 1988,1990,1993 by Paul Vixie
.\" * All rights reserved
.\" *
.\" * Distribute freely, except: don't remove my name from the source or
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.\" * warrantee of any kind, express or implied, is included with this
.\" * software; use at your own risk, responsibility for damages (if any) to
.\" * anyone resulting from the use of this software rests entirely with the
.\" * user.
.\" *
.\" * Send bug reports, bug fixes, enhancements, requests, flames, etc., and
.\" * I'll try to keep a version up to date.  I can be reached as follows:
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.\" $FreeBSD: src/usr.sbin/cron/crontab/crontab.1,v 1.15 2005/01/18 20:02:33 ru Exp $
.Dd December 29, 1993
.Nm crontab
.Nd maintain crontab files for individual users (V3)
.Op Fl u Ar user
.Ar file
.Op Fl u Ar user
.Fl l |
.Fl r |
.Fl e
utility is the program used to install, deinstall or list the tables
used to drive the
.Xr cron 8
daemon in Vixie Cron.
Each user can have their own crontab, and
they are not intended to be edited directly.
(Darwin note: Although
.Xr cron 8
.Xr crontab 5
are officially supported under Darwin, their functionality has been
absorbed into
.Xr launchd 8 ,
which provides a more flexible way of automatically executing commands.
.Xr launchctl 1
for more information.)
If the
.Pa /usr/lib/cron/cron.allow
file exists, then you must be listed therein in order to be allowed to use
this command.
If the
.Pa /usr/lib/cron/cron.allow
file does not exist but the
.Pa /usr/lib/cron/cron.deny
file does exist, then you must
.Em not
be listed in the
.Pa /usr/lib/cron/cron.deny
file in order to use this command.
If neither of these files exists, then
depending on site-dependent configuration parameters, only the super user
will be allowed to use this command, or all users will be able to use this
The format of these files is one username per line,
with no leading or trailing whitespace.
Lines of other formats will be ignored,
and so can be used for comments.
The first form of this command is used to install a new crontab from some
named file or standard input if the pseudo-filename
.Sq Fl
is given.
The following options are available:
.Bl -tag -width indent
.It Fl u
Specify the name of the user whose crontab is to be
If this option is not given,
.Dq your
crontab, i.e., the crontab of the person executing the
Note that
.Xr su 1
can confuse
and that if you are running inside of
.Xr su 1
you should always use the
.Fl u
option for safety's sake.
.It Fl l
Display the current crontab on standard output.
.It Fl r
Remove the current crontab.
.It Fl e
Edit the current crontab using the editor specified by
environment variables.
The specified editor
.Em must
edit the file in place;
any editor that unlinks the file and recreates it cannot be used.
After you exit
from the editor, the modified crontab will be installed automatically.
.Bl -tag -width /usr/lib/cron/cron.allow -compact
.It Pa /usr/lib/cron/cron.allow
.It Pa /usr/lib/cron/cron.deny
A fairly informative usage message appears if you run it with a bad command
.Xr crontab 5 ,
.Xr compat 5 ,
.Xr cron 8 ,
.Xr launchctl 1
command conforms to
.St -p1003.2 .
The new command syntax
differs from previous versions of Vixie Cron, as well as from the classic
SVR3 syntax.
.An Paul Vixie Aq