Hi Anuj, You filed a bug with the core perl distribution. But neither Expect nor IO::Tty are part of it. They are available as separate distributions from the CPAN, are not maintained by the same people as perl itself, and have separate bug trackers. The bug tracker for IO::Tty is at: https://rt.cpan.org/Public/Dist/Display.html?Name=IO-Tty The bug tracker for Expect: https://rt.cpan.org/Public/Dist/Display.html?Name=Expect There are other places to get support, such as web communities like perlmonks.org or stackoverflow.com. Since you are on cygwin, you may be seeing a cygwin-specific issue. In that case, there may be more appropriate places to look that I am not aware of. I am closing this ticket as "rejected" since it is not a bug in perl itself. Best regards, SteffenThread Next