First, we need to know the username. This can easily be done using w command
# w
12:34:31 up 36 days, 14:14, 2 users, load average: 0.07, 0.02, 0.00
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
ironman pts/0 ::1 12:34 2.00s 0.01s 0.01s w
root pts/3 10.29.25.230 12:22 7.00s 0.13s 0.00s bash
Let's say we want to log out ironman from our server. What we have to do is to use a command called pkill against that user.
# pkill -u ironman
All processes that is owned by that user will be killed.
# w
12:34:31 up 36 days, 14:14, 2 users, load average: 0.07, 0.02, 0.00
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/3 10.29.25.230 12:22 7.00s 0.13s 0.00s bash
The ironman user is no longer logged in. Easy peasy.
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