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I have a GNU screen named demo, I want to send commands to it. How do I do this?
screen -S demo -X /home/aa/scripts/outputs.sh yeilds No screen session found.
and doing screen -ls shows that it isn't running.
790
Sending commands to screenscreen has the -X flag which allows you to send a (screen) command to a session. The -p 0 flag is for the window inside screen. If you have created multiple windows ( CTRL+A c ) you can specify the number. With CTRL+A [0-9] you can directly go to that window inside screen.
If you want to send something to all the windows, use # (needs to be quoted) as the window_number. UPDATE: Screen's stuff command also supports ^X (or ^x ) to mean CTRL-X so the following command can also be used to send CTRL-C .
Log files of current screen sessions can be started with the Ctrl+a H command, which will make a file called screenlog. X where X is the number of your screen session. A screenshot of what is currently in your screen window can be invoked with Ctrl+a h, creating a file called hardcopy.
If the Screen session isn't running, you won't be able to send things to it. Start it first.
Once you've got a session, you need to distinguish between Screen commands and keyboard input. screen -X expects a Screen command. The stuff command sends input, and if you want to run that program from a shell prompt, you'll have to pass a newline as well.
screen -S demo -X stuff '/home/aa/scripts/outputs.sh ' Note that this may be the wrong approach. Are you sure you want to type into whatever is active in that session? To direct the input at a particular window, use
screen -S demo -p 1 -X stuff '/home/aa/scripts/outputs.sh ' where 1 is the window number (you can use its title instead).
To start a new window in that session, use the screen command instead. (That's the screen Screen command, not the screen shell command.)
screen -S demo -p 1 -X screen '/home/aa/scripts/outputs.sh' If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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