This is a known DOS/Windows bug. I'm fairly sure that DOS used NUL as a null device, and that Windows kept it around (not sure why, guess it's for backward-compatibility). -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple