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I have a few idle ssh sessions that I want to kill. This remote server is used by many users, how do I identify the pids of the sessions that I own?

When I run who, I get a list of ssh sessions labeled by username.

$ who
                                                                                       
me      pts/0        2020-11-23 18:05 (tmux(id).%0)
me      pts/1        2020-11-06 13:28 (<ip 1>)
someone    pts/2        2020-11-09 09:36 (<ip 2>)
someone    pts/3        2020-11-26 20:26 (<ip 2>)
...

When I run pstree, the sessions are no longer labeled by username.

$ pstree -p | grep sshd 

|-sshd(930)-+-sshd(3518)---sshd(3536)---python(5736)-+-{python}(5744)
           |           |-sshd(4285)---sshd(4308)
           |           |-sshd(5428)---sshd(5450)
...
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Unless you are the root user, you will not be able to do anything to anybody else's processes, so there's no danger in just signalling all sshd processes:

pkill sshd

If you want to explicitly limit this to your own processes:

pkill -U "$USER" sshd

or, if the USER variable isn't used in the shell that you are running, try "$LOGNAME" in place of "$USER", or

pkill -U "$(id -un)" sshd

See also the manual for the pkill command.

Use pgrep instead of pkill if you want to get a list of the process IDs of the matched processes. Use pkill or pgrep with -o to only signal or list the oldest process.

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    Awesome, thanks. And when I run pkill sshd, will that kill the ssh session I'm currently running the command from? And will that also permanently kill my tmux sessions? – user443888 Nov 27 '20 at 16:53
  • @user443888 It would send the TERM signal to all sshd processes that you own. I'm unsure whether that would kill tmux, but I don't think so. It would be fairly easy to test (on my OpenBSD system, it does not kill tmux and I doubt it would do on Linux). – Kusalananda Nov 27 '20 at 20:34

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