I've got a screen with a critical process running in it. I can't kill it, but I need to know the command that was used to start it. Can anyone offer a solution?
If your long running critical process is running in screen then Ctrlac will start a new screen.
You can then find the command line for the process with
which should show you the complete command line.
If it's not running in screen you can try Ctrlz followed by