Excellent Post @ http://www.markus-gattol.name/ws/time.html#cron Once we get to know what a cron job is, we can go on an get going on our linux box. This link will help you create your own cronjob: http://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/
In this fast world of IT...Learning is quintessential :) Here is my way of learning!!!