But when processing each line, I am only aware of the pid and not the process running

That's why I changed to a hash of arrays to store the PIDs and process information. You can get the program name by $pid{$fh}[1], or put more information into that array as necessary.

Update: your question about -| can be fully answered by reading open's documentation. The short answer is it opens a process for reading.

In reply to Re^3: forking and monitoring processes by revdiablo
in thread forking and monitoring processes by Anonymous Monk

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