SSH login to your server

crontab -e

* * * * 6 /usr/bin/rm -rf /tmp/*    {( Cron job to delete all the files in the tmp folder )}

^x {(Ctrl x -  to exit the edit mode)}

Click Y to save.

Hit the Enter button.

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* * * * * {(Cron job will run every minute)}

0 0 * * * {(Cron job will run every day)}

* * * * 6 {(Cron job will run every Saturday)}