Crontab Commands setup cron jobs in linux Edit your crontab file, or create one if it doesn't already exist.
Submitted by inder on Wed, 11/19/2008 - 13:29.
In linux we can change cron tab file for setting and configuring cron jobs.We can use Vi editor for opening this file.
e.g crontab -e
Crontab Commands
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crontab -e Edit your crontab file, or create one if it doesn't already exist.
crontab -l Display your crontab file.
crontab -r Remove your crontab file.
crontab -v Display the last time you edited your crontab file. (This option is only available on a few systems.)
Crontab syntax :-
A crontab file has five fields for specifying day , date and time followed by the command to be run at that interval.
| * * * * * command to be executed - - - - - | | | | | | | | | +----- day of week (0 - 6) (Sunday=0) | | | +------- month (1 - 12) | | +--------- day of month (1 - 31) | +----------- hour (0 - 23) +------------- min (0 - 59) |
A line in crontab file like below removes the tmp files from /home/someuser/tmp each day at 6:30 PM.
30 18 * * * rm /home/someuser/tmp/*
you can find more updates on article :- http://www.adminschoice.com/docs/crontab.htm
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