Crontab Add

Crontab Add type

1: Minute (0-59)
2: Hours (0-23)
3: Day (0-31)
4: Month (0-12 [12 == December])
5: Day of the week(0-7 [7 or 0 == sunday])
/path/to/command – Script or command name to schedule
Easy to remember format:

* * * * * command to be executed
- - - - -
| | | | |
| | | | ----- Day of week (0 - 7) (Sunday=0 or 7)
| | | ------- Month (1 - 12)
| | --------- Day of month (1 - 31)
| ----------- Hour (0 - 23)
------------- Minute (0 - 59)

Example Run every minute.

crontab -e 

* * * * * /usr/bin/iptrafvol.pl -l 

Run every midnight

0 0 * * * /path/to/command

Run every 2 AM

0 2 * * *  /usr/sbin/ccsquid

30 minute after 3 AM

30 3 * * *  /usr/sbin/ccsquid