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I would like to start a process in its own process group (or, alternatively, change its group once started) and: have the processes in the group respond to Ctrl + C from the terminal get the id of the process group so that I can terminate all the processes in the group via the kill command. Note: I tried setsid prog [args] but the processes do not respond to Ctrl+C from the terminal nor I could get the new process group id. I also tried to change the process group via Perl's setpgrp($pid, $pid) and POSIX::setpgid($pid, $pid) , to no avail. Edit: The larger problem: I have a process (single-threaded; let's call it the "prolific" process P ) that starts many child processes synchronously (one after another; it starts a new one when the previous child process terminates). From the terminal, I want to be able to kill P and the tree of processes below it. To do that, I could simply arrange to kill the processes in P 's group. However, the default behavior is that P is in the group of its parent process. That means that P 's parent will be killed if I kill all the processes in P 's group, unless I have P and its tree be in their own group. My intention is to kill P and the tree below it, but not P 's parent. Also, I cannot modify P 's code itself.

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