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Accepted
JohnMerlino
Asked: 2013-12-08 15:09:30 +0800 CST

Is there a way to check if others are logged into server when you are?

  • 772

I am logged into Ubuntu server via ssh and I would like to know if another user is logged in via SSH as well. Is there a command that I can run to accomplish this?

ssh

2 Answers

  1. Best Answer

    Just type who:

    ~$ who
(unknown) tty7         2013-12-06 13:37 (:0)
john      pts/0        2013-12-08 00:16 (192.168.0.100)
jane      pts/1        2013-12-08 00:17 (192.168.0.101)

    EDIT

    Regarding your bonus question :)

    To see login history for users you can use last -i. This will show all logins and IP addresses since start of current logfile /var/log/wtmp.

    Depending on your logrotate you can show previous logs with last -f /var/log/wtmp.1, too.

    To only show the very last login for each user use last -i | sort -r | uniq -w 16

    ~$ last -i | sort -r | uniq -w 20
wtmp begins Sun Dec  1 16:54:49 2013
john    pts/0        192.168.0.100    Sun Dec  8 18:49   still logged in   
jane    pts/1        192.168.0.101    Sun Dec  8 00:17 - 00:34  (00:16)
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  2. who is good, but simply w is better.

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