|CRONTAB(1)||General Commands Manual||CRONTAB(1)|
crontab — maintain
crontab files for individual users
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
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
NOTE: if they exist,
/var/cron/cron.deny must be readable by group
crontab is unable to read the files,
users will not be allowed to use
The options are as follows:
EDITORenvironment variables. After you exit from the editor, the modified crontab(5) will be installed automatically.
crontabexamines “your” crontab(5); i.e., the crontab of the person executing the command. Note that su(1) can confuse
crontaband that if you are running inside of su(1) you should always use the
-uoption for safety's sake.
A fairly informative usage message appears if you run it with a bad command line.
crontab utility is compliant with the
IEEE Std 1003.1-2008 (“POSIX.1”)
The flag [
-u] is an extension to that
The flag [
-e] is marked by
IEEE Std 1003.1-2008 (“POSIX.1”) as
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 <email@example.com>
|October 26, 2015||OpenBSD-current|