$ diff -rq pr1.1/img/ pr1.2/img/ |grep -v "User Guide" Files pr1.1/img/autorun.inf and pr1.2/img/autorun.inf differ Files pr1.1/img/.n900.ico and pr1.2/img/.n900.ico differ Files pr1.1/img/.videos/Nokia_N900.mp4 and pr1.2/img/.videos/Nokia_N900.mp4 differ