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If I have the PID number for a process (on a UNIX machine), how can I know the name of its associated process? What do I have to do?

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Did you try either:

ps -p <PID> -o cmd

or if you only want the command name

ps -p <PID> -o comm

Or try this one:

cat /proc/<PID>/cmdname
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Try ps -eo pid,command PIDNUMBER

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