Thursday, January 10, 2013

Killing a SSH User Shell Session

As Administrator, when you do a notice that you will some of your users have idle and active ssh session. The idle ssh session could be be due to the hanged ssh session. So the question is how to remove the individual session without killing the active and genuine session.

First thing first, do

# w 

You may get some information like this
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT 

user1   pts/31   :24.0            08Oct12 22days  0.05s  0.05s -bash
user2   pts/24   :30              02Jan13  2days  0.66s  0.66s -bash
user3   pts/55   :17              12Nov12 59days  0.01s  0.01s -bash

To get process id (PID) of the idle session, do the command
# ps -aux |grep 'pts/31'

Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.7/FAQ
root     27552  0.0  0.0  61172   776 pts/1    S+   00:41   0:00 grep pts/31
546      30050  0.0  0.0  64188  1516 pts/31   Ss+   2012   0:00 -bash

Kill the Process
# kill -9 30050 

The idle ssh session has been removed. You can verify with the command "w"

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