How to setup an automatic function?

[eluser]Phil Sturgeon[/eluser]
[quote author="Corey Freeman" date="1279503091"]For my game, the player's stamina needs to replenish itself automatically once every 6 hours. I thought setting up a cron job would work, but it won't run the controller that way. So I'm not sure how to go about doing this.[/quote]

Google search for "CodeIgniter command line" :-p

Wiki: CI on the command line