Stop screen redirecting output without kill the screen

Question

I run a script in a screen terminal (screen -L), redirecting its output into a screenlog.0 file.
Now the file is getting dangerously big and I was wondering if you knew a way in order to stop the output to be saved still preserving the script running. I can’t actually stop the script now.

Answer 1

You can swap the file descriptor for screenlog.0 with one for /dev/null, which will just discard whatever is written to it.

GDB can do that. Use this wrapper script by Robert McKay to change file descriptor on the fly:

./fdswap.sh /path/to/screenlog.0 /dev/null $pid_of_process_writing_to_log

Disclaimer: I did not write that script. Although I already used it with success, I cannot guarantee that it will always work as expected.