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There is a program that takes unexpectedly long to run. Before I started it, I did not start screen. So I dont know how to detach the process now. Is there any way to keep this process running on background even if I quit the current ssh session without killing it first?

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The typical way to do this is with CTRL-z to suspend the process, and then bg to resume it in the background. Once running as a background process, you can disconnect and it will keep running.

If you need to reattach the process to a terminal later, you can use reptyr, which should be in your distributions repositories.

  • Under bg, will the process get killed when the ssh session close? – Will Oct 7 '15 at 13:28
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    No, it will keep running in the background. If you disconnect and reconnect you'll be able to see it in the process list. – seumasmac Oct 7 '15 at 16:07
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disown should prevent the shell from sending it a HUP or such on exit of the shell.

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