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To see list of logged in user type who or w command:

[root@localhost ~]# who
root     tty1         2015-07-15 12:00
root     pts/0        2015-07-15 12:05 (:0.0)
root     pts/1        2015-07-15 12:06 (:0.0)
root     pts/5        2015-07-28 13:26 (150.236.11.171)
[root@localhost ~]# w
 13:41:44 up 13 days, 39 min,  4 users,  load average: 0.26, 0.50, 0.52
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
root     tty1     -                15Jul15 13days  0.12s  0.00s /bin/sh /usr/bi
root     pts/0    :0.0             15Jul15 13days 14:12   0.05s /bin/bash
root     pts/1    :0.0             15Jul15 13days  7:27   0.02s /bin/bash
root     pts/5    150.236.11.171   13:26    0.00s  0.06s  0.00s w

Other options

You can pass the following options to the who command (taken from the who command man page):




Just open a  -a, --all         same as -b -d --login -p -r -t -T -u
  -b, --boot        time of last system boot
  -d, --dead        print dead processes
  -H, --heading     print line of column headings
  -l, --login       print system login processes
      --lookup      attempt to canonicalize hostnames via DNS
  -m                only hostname and user associated with stdin
  -p, --process     print active processes spawned by init
  -q, --count       all login names and number of users logged on
  -r, --runlevel    print current runlevel
  -s, --short       print only name, line, and time (default)
  -t, --time        print last system clock change
  -T, -w, --mesg    add user's message status as +, - or ?
  -u, --users       list users logged in
      --message     same as -T
      --writable    same as -T
      --help     display this help and exit
      --version  output version information and exit



[root@localhost ~]# who -u
root     tty1         2015-07-15 12:00  old         2350
root     pts/0        2015-07-15 12:05  old         3330 (:0.0)
root     pts/1        2015-07-15 12:06  old         3330 (:0.0)
root     pts/5        2015-07-28 13:26   .          7180 (150.236.11.171)


root     pts/5        2015-07-28 13:26   .          7180 (150.236.11.171)
[root@localhost ~]# who -a
           system boot  2015-07-15 11:59
           run-level 3  2015-07-15 11:59
root     + tty1         2015-07-15 12:00  old         2350
LOGIN      tty2         2015-07-15 12:00              2352 id=2
LOGIN      tty3         2015-07-15 12:00              2354 id=3
LOGIN      tty4         2015-07-15 12:00              2356 id=4
LOGIN      tty5         2015-07-15 12:00              2358 id=5
LOGIN      tty6         2015-07-15 12:00              2360 id=6
root     + pts/0        2015-07-15 12:05  old         3330 (:0.0)
root     + pts/1        2015-07-15 12:06  old         3330 (:0.0)
           pts/2        2015-07-28 13:36                 0 id=/2    term=0 exit=0
           pts/3        2015-07-28 13:35              6303 id=ts/3  term=0 exit=0
           pts/4        2015-07-28 13:35              6889 id=ts/4  term=0 exit=0
root     + pts/5        2015-07-28 13:26   .          7180 (150.236.11.171)


1009  ps -dN | grep -i pts/2


1010  kill -9 3395









































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