On all unix and linux systems, path names use forward slashes. Backslashes are for escaping characters on the command line (just like in perl).

Update: if you really are that clueless about OS differences, you need File::Spec -- read the man page for that module, and start making a habit of using it. It's part of the perl core (a "built-in" module that is present whenever/wherever perl is installed), and it'll be your constant friend.