[Quick Tips: Kill/ Pkill Users/ Process] :

Force / Kill Logout a User

You terminate a session by killing its parent process, called the session leader. Find out which process it is with:

# ps -dN|grep pts/3

And then kill that process using 

# kill -9 <processid>

Kill and Logout a User

# skill -KILL -u vivek








How to kill the tty in unix


This is the result of the finger command (Today(Monday) when I (Vidya) logged in)
sekic1083 [6:14am] [/home/vidya] -> finger
Name        Tty       Idle   Login Time    Where
Felix   pts/0        -       Thu 10:06  sekic2594.rnd.ki.sw.
john        pts/1       2d       Fri 15:43
john        *pts/2      2d       Fri 15:43
john      *pts/3       4     Fri 15:44
john      *pts/7       -         Thu 16:25
Vidya      pts/0       -         Mon 06:14
Vidya     *pts/5       -         Mon 06:14
Vidya     *pts/6       -         Tue 10:13
Vidya     *pts/9       -         Wed 05:39
Vidya     *pts/10      -         Wed 10:23


Under column the Tty pts/0 and pts/5 are the current active terminals.

Apart from those two pts/6, pts/9 and pts/10 are also present and I had logged into these last week. But the idle time for them is showing as "-" (not idle).

How can I kill these 6,9 and 10 terminals?


You can run:
ps -ft pts/6 -t pts/9 -t pts/10


This would produce an output similar to:
UID        PID  PPID  C STIME TTY          TIME CMD
Vidya      772  2701  0 15:26 pts/6    00:00:00 bash
Vidya      773  2701  0 16:26 pts/9    00:00:00 bash
Vidya      774  2701  0 17:26 pts/10   00:00:00 bash


Grab the PID from the result.

Use the PIDs to kill the processes:
kill <PID1> <PID2> <PID3> ...


For the above example:
kill 772 773 774


If the process doesn't gracefully terminate, just as a last option you can forcefully kill by sending a SIGKILL
kill -9 <PID>






how to "kick" a shell userlogin as root and execute "ps -aux" you will see the old SSH session in the process list.


You should see something like this:



Code:
root      2481  0.0  1.0 14452 2040 ?        Ss   12:52   0:00 sshd: root@pts/1
root      2484  0.0  0.8  2980 1624 pts/1    Ss   12:52   0:00 -bash

The first line is for a user logged in as root over SSH, the second one is working directly on the system.

To kill the first process run


Code:
kill -9 2481

to kill the second:


Code:
kill -9 2484