Linux View current logged-in user and kick out user __linux

1, view the current logged-in user

[WILSH@LCL ~]$ Whatis w
(1)-show The Who are logged on and what they are doing
[WILSH@LCL ~]$ W
 09:49:30 up 1 day, 17:19,  4 users,  load average:0.00, 0.00, 0.00
USER     TTY      from              login@   IDLE   Jcpu   pcpu WHAT
root     tty3     -                09:25   23:25   0.10s  0.08s-bash
root     pts/0    192.168.105.188  09:32    9:38   0.02s  0.02s-bash
root     pts/1    192.168.105.188  09:36    9:32   0.03s  0.02s-bash
wilsh    pts/2 192.168.105.188  09:41    0.00s  0.00s  0.00s W

2, kicking out the current online users

A) Pkill

[WILSH@LCL ~]$ Whatis pkill
pkill [Pgrep]        (1)-look up or signal processes, based on name and other  Attribu Tes

[WILSH@LCL ~]$ pkill-kill-u wilsh #-u is used to specify the user name

[WILSH@LCL ~]$ pkill-9-u wilsh #-kill-9 is OK.

[WILSH@LCL ~]$ pkill-kill-t pts/2
[WILSH@LCL ~]$ pkill-kill-t/DEV/PTS/2 # This is a wrong notation. Because it is clearly stated in the man page, if you want to use the-t parameter, you cannot bring the/dev/prefix. <span style= "color: #FF99FF;" ><span style= "Background-color:rgb (255, 255, 153);" > #在centos6.7 kernel 3.10.28 test, found that the write complete device name does not work (such as/DEV/PTS/2), this article is written in kernel 2.6.32, Last night just restarted the 3.10.28 of the kernel, the test is not OK, depressed. </span></span>

b) Skill

[WILSH@LCL ~]$ whatis Skill
Skill                (1)  -Send a signal or the process status

[WILSH@LCL ~]$ skill-9-T PTS/2

[WILSH@LCL ~]$ W
09:57:37 up 1 day, 17:28, 4 users, Load average:0.00, 0.00, 0.00
USER TTY from login@ IDLE jcpu pcpu WHAT
root tty3-09:25 31:32 0.10s 0.08s-bash
Roo   T pts/0 192.168.105.188 09:32 17:45 0.02s 0.02s-bash
root pts/1 192.168.105.188 09:36 17:39 0.01s 0.01s-bash
wilsh pts/2 192.168.105.188 09:57 0.00s 0.00s 0.00s w
[WILSH@LCL ~]$ skill-9-U wi Lsh