TekBytz

Archive for November, 2008

Closing telnet session without terminating the foreground process

by on Nov.04, 2008, under Unix

Finally have found out a way to terminate the telnet session with out killing the foreground process which is running. Anyone struck with the above situation can follow this 🙂

Assume a script “script1” is running in the foreground for a long time and this script needs to be retained even if the telnet session is closed. Here are the steps which needs to be followed.

  1. On the telnet screen press <CTRL + Z>. This will temporarily stop the script or process to run.
    $ ./script1.ksh
    [1] + Stopped (SIGTSTP)        ./script1.ksh
  2. Type in the command “bg” to run the process in background
    $ bg
    [1]     ./script1.ksh&
  3. Identify the session process ID. This can be done by giving the “ps” command in the prompt.
    $  ps
    PID      TTY   TIME  CMD
    4882522  pts/7  0:00 ps
    4984988  pts/7  0:00 -sh
  4. Identify the PID of the script which is is shifted to background. In our case “script1” This can be done by ps command piped with grep as below.
    $ ps -ef | grep script1.ksh
    user1 4399240 4984988   0 08:57:49  pts/7  0:00 grep script1.ksh
    user1 5029960 4829226   0 07:57:23      -  0:00 /usr/lpp/ars/bin/script1.ksh
  5. Now with all the PID’s collected, use “nohup” command
    $ nohup -p 4984988
    $ nohup -p 5029960

This will make the script or process not to be terminated even if the telnet session is closed.

NB: The telnet session process 4984988, will be running at the background unless it is killed.

Courtesy: Santhosh Fabian

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