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I got a parent and a child process running, I know their IDs.

How do I utilize 'ps' and 'watch' to filter them out, so that I can see their used CPU times?

I tried 'watch ps -u USERNAME', but as you can imagine there are a lot more processes than the desired ones.

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If the PIDs are e.g. 340 and 520, then you can try the following:

$ watch --interval 2 --difference "ps -p 340,520 -o pid,ppid,%cpu,cputime"

Here watch will mark the difference of outputs running with 2 seconds interval, here we have used the output formatting -o option to get only process ID (pid), parent process ID (ppid), percentage of cpu utilization (%cpu) and the cpu time (cputime).

Check man ps for more ps output formatting options.

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