CRONTAB(1) | General Commands Manual | CRONTAB(1) |
crontab
— maintain
crontab files for individual users
crontab |
[-u user]
file |
crontab |
[-e | -l |
-r ] [-u
user] |
crontab
is the program used to install,
deinstall, or list the tables used to drive the
cron(8) daemon. Each user can
have their own crontab(5),
and though these are files in /var/cron/tabs, they
are not intended to be edited directly.
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.
If the /var/cron/cron.allow file
exists, then you must be listed therein in order to use
crontab
. If the
/var/cron/cron.allow file does not exist but the
/var/cron/cron.deny file does exist, then you must
not be listed in the
/var/cron/cron.deny file in order to use
crontab
. If neither of these files exists then only
the super user will be allowed to use crontab
.
NOTE: if
they exist, /var/cron/cron.allow and
/var/cron/cron.deny must be readable by group
crontab. If crontab
is unable to read the files,
users will not be allowed to use crontab
.
The options are as follows:
-e
VISUAL
or EDITOR
environment variables. After you exit from the editor, the modified
crontab(5) will be
installed automatically.-l
-r
-u
usercrontab
examines “your”
crontab(5); i.e., the
crontab of the person executing the command. Note that
su(1) can confuse
crontab
and that if you are running inside of
su(1) you should always use the
-u
option for safety's sake.A fairly informative usage message appears if you run it with a bad command line.
The crontab
utility is compliant with the
IEEE Std 1003.1-2008 (“POSIX.1”)
specification.
The flag [-u
] is an extension to that
specification.
The flag [-e
] is marked by
IEEE Std 1003.1-2008 (“POSIX.1”) as
being optional.
The cron.allow/deny mechanism is marked by IEEE Std 1003.1-2008 (“POSIX.1”) as being an X/Open System Interfaces option.
Paul Vixie <vixie@isc.org>
October 26, 2015 | OpenBSD-6.4 |