[iggy1]

But what are you going to do with HTTP if you have no PhP script? Nothing. Can PhP execute commands from the command line of your server? I'm not sure i know very little about PhP.

Besides a plugin would work much better and will be a lot faster than waiting for a HTTP response.

EDIT: There is a plugin called "execute" that might already do what you need. I can't remember if theres a linux version though.