disassociate terminal from a running process?

[Doug O'Leary]

Hey;

I'm not sure this is possible, but, I've been wrong before, so it's worth a quick question:

HPUX 11.23, pa-risc:

A cohort kicked off a database restore process about three hours ago with an expected duration of another 10 hours - so restarting isn't exactly an option.

Is there anyway that he can kick his job into the background and disassociate his terminal so he can log off and go home before 0200 tomorrow morning?

Linux apparently has a disown command which I have to try out sometime; however, I haven't been able to find/think up anything that will help this poor schmuck.

Thanks for any tips/suggestions.

Doug O'Leary

[Doug O'Leary]

My bad: if someone could move this to the sysadmin section, I'd appreciate it....

Doug

[Hakki Aydin Ucar]

Hi,

I am not familiar 11.23 ,but if I get correct your issue, did you try
nohup command &
I use it in 11.11 works good, but I am not sure if it has a timeout somehow ?

[Michael Steele_2]

Ah Yep, for two decades now

nohup command &

is the one.

[Raj D.]

Doug,

Check this out:

1. Suspend the forground job with Ctrl+z
2. Use bg command to push it to Background.
3. Verify with 'jobs' commnd , you will see the job runnig in background.


Example:
# find / -name abc -print


[1]+ Stopped find / -name abc -print
# bg
[1]+ find / -name abc -print &

# ps -ef | grep -i find
root 4289 4217 4 19:50 pts/2 00:00:01 find / -name abc -print
#


# jobs
[1]+ Running find / -name raj -print &
#
--------------------------------------------


Cheers,
Raj.

[Raj D.]

Doug,
However if you want to leave the terminal (log off) you have the only option to start the process with "nohup" as menoned above . Otherwise it will terminate the process with logoff, even it is in background.


Example:
# nohup command &
# exit

- From another session yo can verify with ps command.


Hth,
Raj.

[Doug O'Leary]

Hey;

I don't think I was clear; the process is already running and restarting it isn't really an option since it was already 3 hours into a 13 hour run. So, nohup ${cmd} is out.

I know about suspending the command and bg, however, if you log out, the process dies. I was hoping there was something like

nohup ${pid}

however, that obviously doesn't work.

As I expected, not possible to disassociate the terminal from an already active program...

Thanks for the responses.

Doug

[dirk dierickx]

'screen' is excellent for this, ofcourse now it is to late. i'm not aware of attaching already running processes to a new screen.

still worth checking out:
http://en.wikipedia.org/wiki/GNU_Screen

[Hakki Aydin Ucar]

You are clear to me now, but I do not know a solution for this problem, if I haapen to find a way I will notify you. By the way ,if you find a solution please share with us here.

[Dennis Handly]

I think someone asked this before and of course it was mentioned to use nohup. And the author was stuck because it was already started.

And I don't think it can be done. Perhaps one of these threads?
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1364756
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1317746
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1304160
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1154094
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1119164
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1050233

[OldSchool]

"Linux apparently has a disown command which I have to try out sometime; however, I haven't been able to find/think up anything that will help this poor schmuck."

"disown" is a bash shell builtin...and not linux-dependent. If you've installed bash, *and* he/she is using that shell, it should work.

If they are using one of the std issue shells on HP-UX, then unfortunately that user is S.O.L... All of the alternatives available require that you take some action at the time the command is issued....

[Dennis Handly]

>OldSchool: "disown" is a bash shell builtin and not linux-dependent. If you've installed bash, *and* he/she is using that shell, it should work.

I'm not sure how? If the HP-UX kernel doesn't support, there is no way bash can.

[OldSchool]

Dennis: "I'm not sure how? If the HP-UX kernel doesn't support, there is no way bash can."

Rash assumption on my part that bash was bash no matter where it runs. The man page says that it removes items from the "jobs table". Doesn't mention that that requires OS support.

I merely noted that it's *not* a separate executable, but a bash builtin. Having noted that, I'd expect bash to behave identically on all installations unless specifically noted otherwise.....

So much for expectations....