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CronTab

Usage

crontab file
crontab { -l | -r | -e }

Crontab can be used to install, deinstall or list the cron tables used to automate simple daily tasks you want to occur.
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.
The following options are available:

-l Display the current crontab on standard output.
-r Remove the current crontab.
-e Edit the current crontab using the editor specified by the VISUAL or EDITOR environment variables. After you exit from the editor the modified crontab will be installed automatically.

Crontab files are created following this format:

Fields are as follows:
minute	hour	day	month	weekday	command
0-59	0-23	1-31	1-12	1-7 1= monday