17

If I start a process with nohup:

nohup WHATEVER &

then how can I see it again? I mean how to attach my terminal to it again under Linux, e.g.: Ubuntu 11.04 - just like with the screen package.

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  • I want to run a nohup job and to that already running process run a specific command (e.g. authentication). In fact the ideal solution would be to first run reauth command and the the real job all under the same nohup process id. So that the nohup processes never loses the kerberos ticket. So I want to run reauth to an already running nohup session automatically (i.e. without screen or tmux). How does one do that?
    – Charlie Parker
    Nov 14, 2022 at 22:20

2 Answers 2

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7

What do you want to do with it?

As other poster has said, screen is better, you can attach/reattach.

nohup does not disconnect from terminal, it makes your app ignore SIGHUP, and (usually) redirects stdout/stderr. Run jobs in your terminal. It may just be a background job, and you can bring it back with fg. I don't know how to get stderr/stdout once you redirect it.

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  • Once I close the ssh session, I do not see the process in the list of jobs and cannot fg it :-( Is there a remedy to this?
    – Lord Loh.
    Apr 1, 2012 at 1:42
  • 1
    @LordLoh. no, once you disconnect with nohup, you can not reconnect. if you want to reconnect, try screen
    – Rich Homolka
    Apr 2, 2012 at 15:32
  • I want to run a nohup job and to that already running process run a specific command (e.g. authentication). In fact the ideal solution would be to first run reauth command and the the real job all under the same nohup process id. So that the nohup processes never loses the kerberos ticket. So I want to run reauth to an already running nohup session automatically (i.e. without screen or tmux). How does one do that?
    – Charlie Parker
    Nov 14, 2022 at 22:20
3

You should have used screen in the first place as it is a lot more flexible than nohup.

But if you want to attach to the process in the same way as screen, this link provides more info : https://serverfault.com/questions/24425/can-i-nohup-screen-an-already-started-process

Basically you can either use reptyr as described in the link, or you can use an old script called screenify. I found the script here : http://isteve.bofh.cz/~isteve/knowledgebase/articles/screenify.html

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1
  • I want to run a nohup job and to that already running process run a specific command (e.g. authentication). In fact the ideal solution would be to first run reauth command and the the real job all under the same nohup process id. So that the nohup processes never loses the kerberos ticket. So I want to run reauth to an already running nohup session automatically (i.e. without screen or tmux). How does one do that?
    – Charlie Parker
    Nov 14, 2022 at 22:20

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