Cron

The Linux way to schedule commands.

http://www.adminschoice.com/crontab-quick-reference

Setting up a script to run a script in your home folder every five minutes (and log it)

 crontab -e

and edit it to something like

 */5 * * * * /home/mmurtaugh/xpub.sh > /home/mmurtaugh/xpub.log