\" $NetBSD: crontab.1,v 1.6 2024/10/29 22:22:09 kre Exp $

\" $NetBSD: crontab.1,v 1.6 2024/10/29 22:22:09 kre Exp $
\"
\"/* Copyright 1988,1990,1993 by Paul Vixie
\" * All rights reserved
\" */
\"
\" Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
\" Copyright (c) 1997,2000 by Internet Software Consortium, Inc.
\"
\" Permission to use, copy, modify, and distribute this software for any
\" purpose with or without fee is hereby granted, provided that the above
\" copyright notice and this permission notice appear in all copies.
\"
\" THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
\" OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
\"
\" Id: crontab.1,v 1.7 2004/01/23 19:03:32 vixie Exp
\"
Dd May 6, 2010
Dt CRONTAB 1
Os
Sh NAME
Nm crontab
Nd maintain crontab files for individual users (ISC Cron V4.1)
Sh SYNOPSIS
Nm
Oo Fl u Ar user Oc Ar file
Nm
Oo Fl elr Oc Oo Fl u Ar user Oc
Sh DESCRIPTION
Nm
is the program used to install, deinstall, or list the tables
used to drive the
Xr cron 8
daemon in ISC Cron.
Each user can have their own crontab, and though
these are files in
Pa /var/cron ,
they are not intended to be edited directly.
Pp
If the
Pa /var/cron/allow
file exists, then you must be listed therein in order to be allowed to use
this command.
If the
Pa /var/cron/allow
file does not exist but the
Pa /var/cron/deny
file does exist, then you must not be listed in the
Pa /var/cron/deny
file in order to use this command.
If neither of these files exists, depending on the compiled in settings,
only the super user will be allowed to use this command,
or everyone will be allowed to use this command.
On
Nx
everyone is allowed to use this command.
Pp
The default maximum size for a crontab is 256 kilobytes, but this may be
changed for all users on the system by putting the desired maximum size
(in bytes) in the
Pa /var/cron/maxtabsize
file.
Pp
If the
Fl u
option is given,
which is allowed only for privileged users,
it specifies the name of the user whose crontab is to be
tweaked.
If this option is not given,
Nm
examines
Dq your
crontab, i.e., the crontab of the person executing the command.
Note that
Xr su 1
can confuse
Nm
and that if you are running inside of
Xr su 1
you should always use the
Fl u
option for safety's sake.
Pp
The first form of this command is used to install a new crontab from some
named
Ar file
or standard input if the pseudo-filename
Dq -
is given.
Pp
The
Fl l
option causes the current crontab to be displayed on standard output.
Pp
The
Fl r
option causes the current crontab to be removed.
Pp
The
Fl e
option is used to edit the current crontab using the editor specified by
the
Dv VISUAL
or
Dv EDITOR
environment variables.
After you exit from the editor, the modified crontab will be installed
automatically.
Sh FILES
Bl -tag -width /var/cron/maxtabsize -compact
It Pa /var/cron/allow
Optional list of users that are allowed to use
Nm .
It Pa /var/cron/deny
Optional list of users that are disallowed to use
Nm .
It Pa /var/cron/maxtabsize
Maximum size of
Nm
files.
Defaults to
Dv 256
kilobytes.
It Pa /var/cron/tabs/
Directory containing the individual user crontab files, named after the user.
El
Sh DIAGNOSTICS
A fairly informative usage message appears if you run it with a bad command
line.
Sh SEE ALSO
Xr crontab 5 ,
Xr cron 8
Sh STANDARDS
The
Nm
command conforms to
St -p1003.2 ,
except that using
Dq \&-
as
Ar file
is required, for safety reasons, to use standard input to replace the
current crontab.
This new command syntax
differs from previous versions of Vixie Cron, as well as from the classic
At v3
syntax.
Sh AUTHORS
An Paul Vixie
Aq [email protected]