Can I convert a foreground process to NOHUP ?

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06-13-2012

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Can I convert a foreground process to NOHUP ?

OS : AIX 6.1/Solaris 10

After I started running a shell script, I've realized that it will take another 5 hours to complete. Is there anyway I could convert this foreground process to run in nohup mode so that I can go home peacefully ?

I have the process ID

Code:

$ ps -ef | grep myschellscript_process
  nbkp_usr 3461298       1   0 17:17:54      -  1:03 myschellscript_process

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07-14-2012

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Usually ctrl-Z is mapped to susp in stty for a terminal.. so pressing that suspends the running foreground job and it gets a job number... then you can can use the "bg" command to background it. HOWEVER... if the foreground process is tied to tty input... it will block on i/o... so not everything can be successfully backgrounded... I don't see that problem in your case though.

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07-15-2012

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Quote:

Originally Posted by cjcox

Usually ctrl-Z is mapped to susp in stty for a terminal.. so pressing that suspends the running foreground job and it gets a job number... then you can can use the "bg" command to background it. HOWEVER... if the foreground process is tied to tty input... it will block on i/o... so not everything can be successfully backgrounded... I don't see that problem in your case though.

Putting a job in the background doesn't modify its signal mask and make it immune to SIGHUP.

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Alister

---------- Post updated at 11:29 PM ---------- Previous update was at 11:27 PM ----------

I just realized that you responded to a month-old thread. I hope the original poster got some sleep that night.

Regards,
Alister

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07-15-2012

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On Solaris 10 at least, you can use the nohup command afterwards nohup -p pid to prevent the running process to die when you leave your shell and to get its output in a file (nohup.out).

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Quote:

Originally Posted by jlliagre

On Solaris 10 at least, you can use the nohup command afterwards nohup -p pid to prevent the running process to die when you leave your shell and to get its output in a file (nohup.out).

I wasn't aware that any systems provided such an interface. Thanks.

Looks like AIX supports it as well.
nohup Command

Hopefully the OP consulted his man pages soon after posting.

Regards,
Alister

---------- Post updated at 10:37 AM ---------- Previous update was at 09:06 AM ----------

If the script was started with bash or ksh93 (perhaps other shells as well), the disown built-in can be used. This ensures that the interactive shell won't send SIGHUP to that job's process group if its controlling terminal is closed (which is usually the source of a SIGHUP). Note that this does not modify any process' signal mask, so if a SIGHUP arrives from somewhere, the process will be terminated.

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Alister

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