* All rights reserved
*
* Distribute freely, except: don't remove my name from the source or
* documentation (don't take credit for my work), mark your changes (don't
* get me blamed for your possible bugs), don't alter or remove this
* notice. May be sold if buildable source is provided to buyer. No
* 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:
* Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul
*/
$FreeBSD$
.Dd May 13, 2010 .Dt CRONTAB 1 .Os .Sh NAME .Nm crontab .Nd maintain crontab files for individual users (V3) .Sh SYNOPSIS .Nm .Op Fl u Ar user .Ar file .Nm .Op Fl u Ar user { .Fl l | .Fl r | .Fl e } .Sh DESCRIPTION The .Nm 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 though these are files in
a /var , they are not intended to be edited directly.
p If the
a allow file exists, then you must be listed therein in order to be allowed to use this command. If the
a allow file does not exist but the
a deny file does exist, then you must .Em not be listed in the
a 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 command. 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.
p 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.
p The following options are available: l -tag -width indent t Fl u Specify 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. t Fl l Display the current crontab on standard output. t Fl r Remove the current crontab. t Fl e Edit the current crontab using the editor specified by the .Ev VISUAL or .Ev EDITOR 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. .El .Sh FILES l -tag -width /var/cron/allow -compact t Pa /var/cron/allow List of users allowed to use crontab t Pa /var/cron/deny List of users prohibited from using crontab t Pa /var/cron/tabs Directory for personal crontab files .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 with the exception that the dangerous variant of calling .Nm without a file name in the first form of the command is not allowed by this implementation. The pseudo-filename .Sq Fl must be specified to read from standard input. The new command syntax differs from previous versions of Vixie Cron, as well as from the classic SVR3 syntax. .Sh AUTHORS .An Paul Vixie Aq paul@vix.com