disconnect when user double or multiple

linuxino · 06-01-2012, 02:04 PM

Hello everyone, I tried searching on google but not finding answers, I decided to post an interesting topic I hope for you too. Having logged in "es. 4 user" on my Debian, eg. from 4 different locations all with the logged user "debian" from one of these positions as I can do a logout of a single host connected? I try to explain better: - 4 hosts connected to the Debian server as a "debian". - From one of these hosts using "who-to" visualize all user related, but all are "debian", if I want to disconnect, and of course stop the operation that was running as that user I can do? using pkill-u debian-kill me disconnettte them all. thanks

pan64 · 06-02-2012, 01:04 PM

probably you can use last to find out the tty connected to a given host and you need only to kill the processes of that tty.

linuxino · 06-02-2012, 01:10 PM

you tell me how do I kill the process that interests me and how do I identify it?

pan64 · 06-02-2012, 01:16 PM

to identify you can use the command last. You may need to use grep/awk to find out the the important lines probably, you need to investigate what is the way you like.

linuxino · 06-02-2012, 01:49 PM

And how kill the process ?

pan64 · 06-02-2012, 02:08 PM

there is a command to kill a process: kill (yes, this is the name).

rosehosting.com · 06-02-2012, 02:34 PM

Quote:

Originally Posted by linuxino

Hello everyone, I tried searching on google but not finding answers, I decided to post an interesting topic I hope for you too. Having logged in "es. 4 user" on my Debian, eg. from 4 different locations all with the logged user "debian" from one of these positions as I can do a logout of a single host connected? I try to explain better: - 4 hosts connected to the Debian server as a "debian". - From one of these hosts using "who-to" visualize all user related, but all are "debian", if I want to disconnect, and of course stop the operation that was running as that user I can do? using pkill-u debian-kill me disconnettte them all. thanks

You can start by using 'last' as suggested by @pan64 in order to find the the tty and the location of users. For example:

Code:

└─› last | head | grep ^d
d        pts/9        host/ip Sat Jun  2 20:13   still logged in
d        ssh          host/ip Sat Jun  2 20:13   still logged in
=> d        pts/8        host/ip Sat Jun  2 20:13   still logged in <=
d        ssh          host/ip Sat Jun  2 20:13 - 20:13  (00:00)
d        pts/7        host/ip Sat Jun  2 20:13   still logged in
d        ssh          host/ip Sat Jun  2 20:13 - 20:13  (00:00)

then you can get the processes executed by your user, by executing:

Code:

└─› ps -fu d
UID        PID  PPID  C STIME TTY          TIME CMD
d        17943 17917  0 Mar23 ?        00:00:00 sshd: d@pts/7
d        17946 17943  0 Mar23 pts/7    00:00:00 -bash
d        17987 17973  0 Mar23 ?        00:00:00 sshd: d@pts/8
d        17993 17987  0 Mar23 pts/8    00:00:00 -bash
d        18021 18001  0 Mar23 ?        00:00:00 sshd: d@pts/9
d        18022 18021  0 Mar23 pts/9    00:00:00 -bash
d        18858 17993  0 Mar23 pts/8    00:00:00 vim /home/d/example.txt

** in this example my user is 'd'.

so let's say I want to kill the session for the user 'd' logged in from 'host/ip', using the tty 'pts/8' which is running 'vim' for example. I would kill the '-bash' process which will kill user's session.

Code:

└─› kill -9 17993

or better yet you may want to send a SIGHUP (-HUP switch) to the PID instead of killing it with '-9' priority, because this will allow them to exit gracefully.

linuxino · 06-02-2012, 05:24 PM

works, thank you very much. Meanwhile, if there are other solutions let me know.

pan64 · 06-03-2012, 05:12 AM

so you have a solution? Is this ok, or you have still some troubles? Why do you need another solution?

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linuxino · 06-03-2012, 06:08 AM

sorry I said bad

I say it's perfect, but if you can do the same thing with other operations. just out of curiosity. thanks