The Geek Stuff posted a tutorial on running cron jobs

Crontab can be used to schedule a job that runs on certain internal. The example here show how to execute a backup.sh shell script using different intervals.

Also, don’t forget to read our previous crontab article that contains 15 practical examples, and also explains about @monthly, @daily, .. tags that you can use in your crontab.

  How to Run Cron Every 5 Minutes, Seconds, Hours, Days, Months