how to kill the tty in unix

Question

This is the result of the finger command (Today(Monday) when I (Vidya) logged in)

sekic1083 [6:14am] [/home/vidya] -> finger
Name        Tty          


        

Answer 1

In addition to AIXroot's answer, there is also a logout function that can be used to write a utmp logout record. So if you don't have any processes for user xxxx, but userdel says "userdel: account xxxx is currently in use", you can add a logout record manually. Create a file logout.c like this:

#include <stdio.h>
#include <utmp.h>

int main(int argc, char *argv[])
{
  if (argc == 2) {
    return logout(argv[1]);
  }
  else {
    fprintf(stderr, "Usage: logout device\n");
    return 1;
  }
}

Compile it:

gcc -lutil -o logout logout.c

And then run it for whatever it says in the output of finger's "On since" line(s) as a parameter:

# finger xxxx
Login: xxxx                             Name:
Directory: /home/xxxx                   Shell: /bin/bash
On since Sun Feb 26 11:06 (GMT) on 127.0.0.1:6 (messages off) from 127.0.0.1
On since Fri Feb 24 16:53 (GMT) on pts/6, idle 3 days 17:16, from 127.0.0.1
Last login Mon Feb 10 14:45 (GMT) on pts/11 from somehost.example.com
Mail last read Sun Feb 27 08:44 2014 (GMT)
No Plan.

# userdel xxxx
userdel: account `xxxx' is currently in use.
# ./logout 127.0.0.1:6
# ./logout pts/6
# userdel xxxx
no crontab for xxxx

Answer 2

Try this:

skill -KILL -v pts/6

skill -KILL -v pts/9

skill -KILL -v pts/10

Answer 3

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>

Answer 4

You can use killall command as well .

-o, --older-than Match only processes that are older (started before) the time specified. The time is specified as a float then a unit. The units are s,m,h,d,w,M,y for seconds, minutes, hours, days,

-e, --exact Require an exact match for very long names.

-r, --regexp Interpret process name pattern as an extended regular expression.

This worked like a charm.

Answer 5

for example kill pts/0

pkill -9 -t pts/0

Answer 6

If you want to close tty for specific user with all the process, above command is the easiest. You can use:

killall -u user_name