Nov 9 17:55:46 swi007 systemd-logind[927]: New session 27 of user swi007.

I want to see the list of active login session in ubuntu server and would like to close the specific session in my server.


Here are few alternatives to get the list of the current session:

  • The command who - display who is on the system:

    $ who
    spas     pts/1        2017-11-05 21:43 (tmux(1597).%0)
    spas     pts/14       2017-11-09 13:02 (
    guest    tty2         2017-11-09 16:15 (:1)
  • The command w - displays information about the users currently on the machine:

    $ w
     16:16:12 up 3 days, 18:33,  9 users,  load average: 4,33, 2,79, 2,44
    USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
    spas     pts/1    tmux(1597).%0    нд21    3days  3days  3days tmux new-session -d -s my-tmux-session
    spas     pts/14  13:02    1.00s  0.29s  0.01s sshd: spas [priv]
    guest    tty2     :1               16:15    3days  1.27s  0.17s /sbin/upstart --user
  • The command last lastb - show a (history) listing of last logged in users. It provides few analytical options as --until, --since, etc.

  • The command users - print the usernames of users currently logged-in to the current host. It has really limited usage:

    $ users
    guest spas spas

To kill a specific session you could use who -u (or who -a) to print the process numbers and then sudo kill -9 <session-process-number>:

$ who -u
spas     pts/1        2017-11-05 21:43  old         1597 (tmux(1597).%0)
spas     pts/14       2017-11-09 13:02   .         31822 (
guest    tty2         2017-11-09 16:15  old         2225 (:1)

$ sudo kill -9 2225   # this command will kill the third session from the above list

Additionally you could kill all processes of a specific user (reference):

sudo pkill -9 -u <username>

See also:

| improve this answer | |
  • how to kill specific session – zapoxkrishna Nov 9 '17 at 14:20
  • @zapoxkrishna, check the update. – pa4080 Nov 9 '17 at 14:29
  • you missed the last command which as well list all active sessions :) – Videonauth Nov 9 '17 at 14:48
  • Thank you, @Videonauth! Indeed I've never used this command. I've updated the answer. – pa4080 Nov 9 '17 at 14:58
  • 1
    For killing all processes I sorta like the slay command, but yours will do. Alas with systemd (and its logind) the meaning of login session seems to be somewhat different, so you should probably amend this to mention loginctl by now. – 0xC0000022L Sep 2 at 16:12

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