Say if I run some command in background:

./my_script.sh > /dev/null &

and I close putty immediately (which is equivalent to disconnect current session right?).

Will the background process finish? Please advise, thanks.

3 Answers 3


When you exit an interactive bash login shell, it sends a SIGHUP to all children unless the shell option huponexit is set to off.

When most userland processes receive a SIGHUP, they will exit.

You can also prefix the command with nohup to make it ignore the SIGHUP. Moreover, you can disown it using an internal bash function.


If you want backgrounded tasks to persist, look into using screen

To create or reconnect to a screen session called 'myprocess' which will persist across sessions:

  • screen -DR myprocess

To list all screens:

  • screen -ls

Yes it should. Apparently my answer was too short.

  • 2
    The running script is still part of the shell process, even when sent to the background. Without specifying "nohup", the process will die w/ the shell on exit
    – Alex
    Sep 16, 2010 at 22:57

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