Archive for November, 2008
How to close a telnet session without terminating the foreground process which is running
by Frederick Tybalt on Nov.04, 2008, under Unix
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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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