kill user session

Identify the shell you want to kill. To determine your current tty, from your Unix shell prompt, enter: tty
To show all of your running processes, enter: ps -fu username Replace username with your username.
You should see something like this: PID TT STAT TIME COMMAND 13964 v5 I 0:00 elm 13126 ue S 0:00 -bash (bash) 13133 ue R 0:00 ps x 13335 v5 S 0:00 -bash (bash)In the first column, “PID” stands for “process ID”. The second column shows the tty to which your processes are connected. The dash ( - ) before a process name shows that the process is a login shell.
To remove the remote shell, look for the processes with a dash and choose the process number that is not for your current tty. Then issue the following command: kill -HUP processid Replace processid with the process ID number you identified.