Or if you don't want to use Expect when you're not planning on using all of its complexity, you could do something like: http://www.perlmonks.org/?node_id=393312 to put a pesudo-tty inbetween you and the command.

In reply to Re^3: Non-buffered read from program by ph713
in thread Non-buffered read from program by arc_of_descent

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