Thanks Randall R Schulz, Your response was very quick. I just want to make sure that all windows platforms have CYGWIN_ as prefix in cygwin, then I can simply grep CYGWIN_ from uname. Sanjay -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/