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I am connected to an embedded Linux device using GNU screen. The connection is via /dev/rfcomm0 which is a Bluetooth serial interface. I frequently forget to put an & after a CLI command, which blocks the interface until the command completes. I would like to be able to send a ctrl-C break to the CLI, but when I do the terminal just echoes ^C. I've tried changing the flow, XON/XOFF, escape sequences, :stuff $'**' with various *'s.

As far as I understand, there is no way for me to make a second screen interface into the serial device in order to send a kill.

Is there a way for me to send a ctrl-C break to the CLI over screen?

Ken Sills
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I haven't tried it myself, but this answer suggests you could detach from the screen session and run:

screen -S session_name -X at window_number stuff $'\003'

Alternately, could you try sending a ctrl-z and then using bg to put the process in the background? That is, if the ctrl-z gets passed through correctly.

Community
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Eric Renouf
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  • ctrl-z does not get passed through either. I'll try detaching and will report back. – Ken Sills Jun 17 '16 at 17:19
  • detaching and using "stuff" to send that code results in ^C being echoed to the terminal, but the CLI doesn't get the break. – Ken Sills Jun 17 '16 at 17:41