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in reply to nonblocking char reads from OUTPUT stream from open3

ReadKey supposes that the filehandle refers to a terminal (TTY), not to a pipe (which is what Open3 gives you).

The error you reported means (more or less): what you gave me is not a terminal, can't do anything with it.

Try setting autoflush(1) on the filehandle.

-- 
        dakkar - Mobilis in mobile

In Section Seekers of Perl Wisdom