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On Linux (and other Unix-like OS's if there's a general answer), is there an easy way to get an output similar to the time command (current real time, user, and system CPU usage totals) for a process that is still running?

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up vote 3 down vote accepted

Yeah, check out /proc/$PID/stat, that should have what you need. The fields are defined in man proc. Can also pull memory usage and fault information, if you care about taht.

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