Run bash scripts on login

Hi All, I have written a script to help identify some physical security issues we are having in one of the labs at the school campus. It is a bash script that takes a photo of the use on login using the built in iSight camera. I have tried to get this to run on login using the following [code]sudo defaults write com.apple.loginwindow LoginHook /path/to/script[/code] This doesn't work. I am wondering if LoginHooks can only run AppleScripts or I can get my bash script to run. Help greatly appreciated!