booting off users

[JOHN TURNER_2]

morning,

can someone please tell me how you go about logging out users that are on the system.

thanks
john

[Arunvijai_4 · Accepted solution]

Hi John,

You can kill the user's telnet or ssh sessions.
That is the simplest way of doing.

-Arun

[Tiziano Contorno _]

Hi John, -ksh lines refers to the session you should kill.

ps -ef | grep "$(who | awk '{print $2}')"
root 3484 924 0 12:58:08 pts/tc 0:00 telnetd
root 22452 924 0 10:43:23 pts/tb 0:00 telnetd
root 3485 3484 0 12:58:08 pts/tc 0:00 -ksh
root 4168 3485 1 13:01:57 pts/tc 0:00 awk {print $2}
root 4167 3485 1 13:01:57 pts/tc 0:00 ps -ef
root 22453 22452 0 10:43:23 pts/tb 0:00 -ksh
root 4169 4168 1 13:01:57 pts/tc 0:00 who

[Muthukumar_5]

Simply as,

get the process ID of user login as,

# who -u

will give the PID field number 7. Kill it as,

# kill -9

--
Muthu

[Yogeeraj_1]

hi john,

you can run who -u

then kill -15 the PIDs

see also:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=622529


kind regards
yogeeraj

[Carlos Roberto Schimidt]

Hi, before kill the users process i think is better look for process running:

# ps -efl | grep -v root

[Arunvijai_4]

Hi John,

You can also stop ssh daemon and telnetd from /etc/inetd.conf,

# /sbin/init.d/secsh stop
# commenting out,

# telnet stream tcp nowait root /usr/lbin/telnetd telnetd


This will ensure that, no one can login further .

-Arun

[Senthil Kumar .A_1]

Hi,

You can "su" as the user ID. and run the command "kill -9 -1"

ex:

# su - user1
$ kill -9 -1
#

Advantage with this method is, you do not require to search for all the tty's the user has logged into. Because there are scenarios wherein the user would have logged in multiple times through different tty's.

"kill -9 -1" will take care in killing all the process the user has spawned.

Regards,
Senthil Kumar .A

[Pete Randall]

John,

A word of caution: grepping for user id's can lead to unwanted results because grep returns every match available.

A far better and safer way is to run something like this:

PROCESSES=`UNIX95= ps -U $USERNAME | grep -v PID |awk '{ print $1 }' | sort
-n`
for PROC in $PROCESSES
do
echo "\tKilling process $PROC"
kill -15 $PROC
sleep 1
kill -9 $PROC
done

Note that I have done a kill -15 to allow the process a chance to terminate normally and release its resources before resorting to the more brutal kill -9.


Pete

[Richard Darling]

Hi John,
Why do you want to "logout" the user?

If the user were chronically not logging out correctly I would discuss the issues with him/her. I have found that some users think that by simply "hitting the X in the upper right-hand corner is the same as logging out" to quote an email reply I received from one user. So sometimes it is just a matter of education.

If it is a careless user I would discuss it with his/her supervisor, and use the stick of disabling the user's account if the continue to be careless.

As mentioned in above posts, be cautious in killing a process, as you may get undesirable results, especially if it is an application session. Examples of this could be locked records, incomplete updates, etc.

Richard