2 successive commands in one shell_exec?

How do we use string shell_exec ( string $cmd ) to hit another cgi script from within a PHP page? I mean I need to do that, and so with my very newbie level of understanding I think I need to have that shell_exec essentially do 2 things at once: -goto the right dir, and then -fire the script in that dir. like these 2 successive commands in terminal: cd $MyPath ./MyOtherCGI.cgi It seems initially clear at lease how to do either one of those terminal commands from within shell_exec, but not *both*. How do I get both commands in there? Sorry if my Q is too green -Govinda