crontab - phpMan

CRONTAB(1) CRONTAB(1)

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

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

DESCRIPTION
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.

OPTIONS
-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
given.

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

-r The current crontab will be 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 edi-
tor, the modified crontab will be installed automatically.

-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).