146 lines
3.6 KiB
Groff
146 lines
3.6 KiB
Groff
.\"/* Copyright 1988,1990,1993 by Paul Vixie
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.\" * All rights reserved
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.\" *
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.\" * Distribute freely, except: don't remove my name from the source or
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.\" * documentation (don't take credit for my work), mark your changes (don't
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.\" * get me blamed for your possible bugs), don't alter or remove this
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.\" * notice. May be sold if buildable source is provided to buyer. No
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.\" * warrantee of any kind, express or implied, is included with this
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.\" * software; use at your own risk, responsibility for damages (if any) to
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.\" * anyone resulting from the use of this software rests entirely with the
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.\" * user.
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.\" *
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.\" * Send bug reports, bug fixes, enhancements, requests, flames, etc., and
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.\" * I'll try to keep a version up to date. I can be reached as follows:
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.\" * Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul
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.\" */
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 13, 2010
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.Dt CRONTAB 1
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.Os
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.Sh NAME
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.Nm crontab
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.Nd maintain crontab files for individual users (V3)
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.Sh SYNOPSIS
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.Nm
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.Op Fl u Ar user
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.Ar file
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.Nm
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.Op Fl u Ar user
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{
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.Fl l |
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.Fl r |
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.Fl e
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}
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.Sh DESCRIPTION
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The
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.Nm
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utility is the program used to install, deinstall or list the tables
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used to drive the
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.Xr cron 8
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daemon in Vixie Cron.
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Each user can have their own crontab, and though
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these are files in
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.Pa /var ,
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they are not intended to be edited directly.
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.Pp
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If the
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.Pa allow
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file exists, then you must be listed therein in order to be allowed to use
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this command.
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If the
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.Pa allow
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file does not exist but the
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.Pa deny
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file does exist, then you must
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.Em not
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be listed in the
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.Pa deny
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file in order to use this command.
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If neither of these files exists, then
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depending on site-dependent configuration parameters, only the super user
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will be allowed to use this command, or all users will be able to use this
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command.
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The format of these files is one username per line,
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with no leading or trailing whitespace.
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Lines of other formats will be ignored,
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and so can be used for comments.
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.Pp
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The first form of this command is used to install a new crontab from some
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named file or standard input if the pseudo-filename
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.Sq Fl
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is given.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl u
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Specify the name of the user whose crontab is to be
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tweaked.
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If this option is not given,
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.Nm
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examines
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.Dq your
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crontab, i.e., the crontab of the person executing the
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command.
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Note that
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.Xr su 1
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can confuse
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.Nm
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and that if you are running inside of
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.Xr su 1
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you should always use the
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.Fl u
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option for safety's sake.
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.It Fl l
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Display the current crontab on standard output.
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.It Fl r
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Remove the current crontab.
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.It Fl e
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Edit the current crontab using the editor specified by
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the
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.Ev VISUAL
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or
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.Ev EDITOR
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environment variables.
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The specified editor
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.Em must
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edit the file in place;
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any editor that unlinks the file and recreates it cannot be used.
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After you exit
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from the editor, the modified crontab will be installed automatically.
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.El
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.Sh FILES
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.Bl -tag -width /var/cron/allow -compact
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.It Pa /var/cron/allow
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List of users allowed to use crontab
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.It Pa /var/cron/deny
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List of users prohibited from using crontab
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.It Pa /var/cron/tabs
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Directory for personal crontab files
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.El
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.Sh DIAGNOSTICS
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A fairly informative usage message appears if you run it with a bad command
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line.
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.Sh SEE ALSO
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.Xr crontab 5 ,
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.Xr cron 8
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.Sh STANDARDS
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The
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.Nm
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command conforms to
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.St -p1003.2
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with the exception that the dangerous variant of calling
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.Nm
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without a file name in the first form of the command is not allowed by
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this implementation.
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The pseudo-filename
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.Sq Fl
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must be specified to read from standard input.
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The new command syntax
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differs from previous versions of Vixie Cron, as well as from the classic
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SVR3 syntax.
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.Sh AUTHORS
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.An Paul Vixie Aq Mt paul@vix.com
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