I'm not really sure, but since you mention STDERR in the subject, you may be interested in IPC::Open2 or IPC::Open3. If you're just interested in STDOUT, I'd use an explicit open, and then I'd print to "see them on the screen".

In reply to Re: interactively catching STDOUT/STDERR messages by blazar
in thread interactively catching STDOUT/STDERR messages by ckyang74

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