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When I want to kill a process via System Monitor I am presented with 2 quick ways, Kill Process and End Process. What is the difference between this two?

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Per the System Monitor manual, you should normally use "End Process", and only if that fails use "Kill Process":

You usually terminate a process only if you cannot end the process normally as described in To End a Process.

On a technical level this makes me think that End Process sends a SIGQUIT, which allows the process to trap and perform cleanup if needed, but if that fails, Kill Process should send a SIGKILL which should violently terminate the process, without chance of recovery. Use sparingly!

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SIGTERM is the "polite" way to close a program, which is what "End Process" sends. – Rick Sep 21 at 17:13

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