Linux Cumulative User, System CPU Usage of Running Process?

Question

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?

Answer 1

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.