I am interested why processes are grouped additionally while having already a PPID and PID. What's the advantage of process groups?
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Relating in https://unix.stackexchange.com/questions/139222/why-is-the-pgid-of-my-child-processes-not-the-pid-of-the-parent and https://unix.stackexchange.com/q/404054/117549 – Jeff Schaller Feb 22 '19 at 22:35