You need two different things : first grab output from the external program, secondly feed it with your response. That's exactly what IPC::Open2 is for.

Search this site for examples using Open2, they abound.

If you want a more complex interaction, perhaps should you look at Expect instead... YMMV.

In reply to Re: Auto Feeding Data to Unix Programs by wazoox
in thread Auto Feeding Data to Unix Programs by awohld

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