http://www.domain.com/thedirectory/
=>  /cgi-bin/path/myscript.pl ('/')

http://www.domain.com/thedirectory/foo
=>  /cgi-bin/path/myscript.pl ('/foo')

http://www.domain.com/thedirectory/foo/bar
=>  /cgi-bin/path/myscript.pl ('/foo/bar')