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What is the `-KILL` option in `pkill` command

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I have found a way to logout any user by using the command line. By executing the command pkill -KILL -u , I can now log myself out from the session I have entered.
My question is that why there is no description about -KILL switch or option available neither in man pkill nor in pkill --help.
I am using Ubuntu Mate 16.04. Thanck you very much in advance.
Asked by Tower (489 rep)
Jan 31, 2018, 04:08 PM
Last activity: May 3, 2022, 04:14 PM