CRONTAB(1)                   General Commands Manual                  CRONTAB(1)

       crontab - maintain crontab files for individual users (ISC Cron V4.1)

       crontab [-u user] file
       crontab [-u user] [-l | -r | -e] [-i] [-s]

       Crontab is the program used to install, deinstall or list the tables used
       to drive the cron(8) daemon in ISC Cron.  Each user can have their own
       crontab, and though these are files in /var/spool/ , they are not
       intended to be edited directly. For SELinux in mls mode can be even more
       crontabs - for each range. For more see selinux(8).

       If the cron.allow file exists, then you must be listed therein in order
       to be allowed to use this command.  If the cron.allow file does not exist
       but the cron.deny file does exist, then you must not be listed in the
       cron.deny file in order to use this command.  If neither of these files
       exists, only the super user will be allowed to use this command.

       -u     It specifies the name of the user whose crontab is to be tweaked.
              If this option is not given, crontab examines "your" crontab,
              i.e., the crontab of the person executing the command.  Note that
              su(8) can confuse crontab and that if you are running inside of
              su(8) you should always use the -u option for safety's sake.  The
              first form of this command is used to install a new crontab from
              some named file or standard input if the pseudo-filename "-" is

       -l     The current crontab will be displayed on standard output.

       -r     The current crontab will be removed.

       -e     This option is used to edit the current crontab using the editor
              specified by the VISUAL or EDITOR environment variables.  After
              you exit from the editor, the modified crontab will be installed

       -i     This option modifies the -r option to prompt the user for a 'y/Y'
              response before actually removing the crontab.

       -s     It will append the current SELinux security context string as an
              MLS_LEVEL setting to the crontab file before editing / replacement
              occurs - see the documentation of MLS_LEVEL in crontab(5).

       crontab(5), cron(8)


       The crontab command conforms to IEEE Std1003.2-1992 (``POSIX'').  This
       new command syntax differs from previous versions of Vixie Cron, as well
       as from the classic SVR3 syntax.

       A fairly informative usage message appears if you run it with a bad
       command line.

       Paul Vixie <>

4th Berkeley Distribution        16 Januar 2007                       CRONTAB(1)