Name
crontab
Synopsis
crontab [-uuser
] [file
] crontab [-uuser
]options
Runs crontab on your current crontab file, or specifies a crontab file
to add to the crontab directory. A privileged user can run crontab for another user by supplying -u
user
before any of the other options.
A crontab file is a list of commands, one per line, that executes automatically at a given time. Numbers are supplied before each command to specify the execution time. The numbers appear in five fields, as follows:
Minute 0-59 Hour 0-23 Day of month 1-31 Month 1-12 Day of week 0-6, with 0 = Sunday
Use a comma between multiple values, a hyphen to indicate a range, and an asterisk to indicate all possible values. For example, assuming the following crontab entries below:
59 3 * * 5 find / -print | backup_program 0 0 1,15 * * echo "Timesheets due" | mail user
The first command backs up the system files every Friday at 3:59 a.m., and the second command mails a reminder on the 1st and 15th of each month.
Options
- -e
Edit the user’s current crontab file (or create one).
- -l
List the user’s file in the crontab directory.
- -r
Delete the user’s file in the crontab directory.
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