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how to tell if PID is running in foreground or background

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GNUser:
That does seem more correct.
However, I tested what you suggested before several times and it works as intended.
I guess when a process is the process group leader, its PID will be the same as the process group ID.

Rich:
Hi GNUser
Since it appears that a  PID  and a  process group ID  don't have to match, I  felt I should correct my answer. After all, someone
may come across this at a later date, and that distinction may be important to them.

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