I just found the new version of sed, so I installed it. I tried the same thing and the problem did not occur. I think the problem was solved...
Sorry to bother. kei@cygwin% sed -V GNU sed version 4.0.5 -- Kei Tsuji -- 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/