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How can screen be used to start a new session and run a command within that session without killing that session?

 screen -S myScreenName runSomething

I tried the above command and it says

[screen is terminating]

Did it run the command then kill the screen? I would like the screen to be detached after running the command instead of killing it. How can that be done?

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marked as duplicate by Jenny D, Andrew B, kasperd, womble Nov 27 at 6:41

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Why are you using screen here at all, if the command is just going to exit immediately? – Michael Hampton Feb 27 '14 at 2:29
@MichaelHampton the command doesn't exit immediately, it runs a daemon that prints to stdout, so I would like to keep it in a screen session. I will be starting the screen session from an Ansible playbook. I don't know why screen terminates when I ran that command. – Nyxynyx Feb 27 '14 at 2:32
Then tell the daemon not to daemonize. – Michael Hampton Feb 27 '14 at 2:35
@MichaelHampton Great that works. Can screen be asked to detach after running the command? Tried -d but it says There is no screen to be detached matching myScreenName – Nyxynyx Feb 27 '14 at 2:50

3 Answers 3

to run a command and detach from the session:

screen -d -m runSomething
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The screen still terminates when using this command. – Luc Jan 4 at 23:34

This script prevent session killing:

screen -dmS test bash -c 'echo waiting 5 senconds...; sleep 5; exec bash'


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If you keep forgetting the right letters that go after dash, in order to avoid revisiting this question, you might as well type:

screen -h

where you'll see:

-dmS name     Start as daemon: Screen session in detached mode.
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