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On a remote server I have multiple screens open and I use each one for different purpose. For example the screen with the ID 'build' it is being used to compile some programs. I can open that screen anytime, using:

 ssh myserver -t screen -r build

However, I 'd like to execute a command on that remote screen, directly from my host machine. For example I 'd like to perform an ls in the remote build screen. I 've tried something like:

 ssh myserver -t screen -r build -X ls .

but without any luck.

Any ideas? Is this even possible?

Thanks!

EDIT: my actual use case:

./buildSomethingOnRemoteScreen() && ./fetchTheBuiltOutputAndDoSomethingWithIt()
  • Not 100% if this will work but can you try wrapping the ls command in double quotes? – ryekayo Nov 11 '15 at 20:43
  • Not. still getting 'Connection to myserver closed' – Paschalis Nov 11 '15 at 20:44
  • Possibly a duplicate: stackoverflow.com/questions/7049252/… – Valentin Bajrami Nov 11 '15 at 20:48
  • If I'm reading man screen correctly, the -X option should only send a command, not reattach. Can you attach to the screen after doing that, and see if it ran the command silently? – Tom Hunt Nov 11 '15 at 21:07
  • It might do actually, but I want to know when something on remote has finished before I continue! I 've updated my question to put my actual use case.. and I think it might not be possible! Thanks though! – Paschalis Nov 11 '15 at 22:05
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You can execute any script with paste command:

# read script into register p
ssh hostname screen -S build -X readreg p script_on_the_host
# paste contents of register p into running screen session
ssh hostname screen -S build -X paste p
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I use tmux (more flexible than screen) on my server, and to executing a command directly after connecting:

ssh myserver -t 'tmux send-keys -t session-name "ls ./" C-m; tmux attach -t session-name '

You just have to make sure that there is a session running with session-name. The C-m emulates ENTER after typing in "ls ./"

  • I consider to move from screen to tmux or byobu. I will make the switch at some point in the future, and check this out! – Paschalis Nov 11 '15 at 23:58

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