Based on your description the program you're using (IC4.pl) is either displaying directly to the terminal, or expecting input from the terminal, instead of the normal STDOUT and STDIN. The typical solution to dealing with interactive programs like this is to use Expect.

In reply to Re: Cannot read from STDIN and write to STDOUT using IPC and pipes by Somni
in thread Cannot read from STDIN and write to STDOUT using IPC and pipes by abhinav

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