Cron Jon With Code Igniter

[eluser]Zion.b.y[/eluser]
hallow everyone,
I've opened with New Topic because I've noticed that there is not much info about cron jobs.

i have a few questions about cron jobs with code igniter and about cron specific:

1. what is the cron job command in order to operate a php code
i.e. lets say i have a php page with some php code and i want to run it every sunday,
what is the cron command for it.

2. if my php code is in a function in a controller, do i simply enter the http... link?


i would be happy to get a quick tutorial about the cron jobs, and not just how to create a cron job but also how to reffer the job to the php code,

thanks a lot everyone

Zion

P.S - do not direct me to the http://codeigniter.com/wiki/Cron_job_bootstrapper/ because i only have access to the cPanel, i don't have access to the root of the host