Came to say that - ctrl-a [ - move to the text you want - press space to start selection - press space to end selection - go to another screen, ctrl-a ] to

Came to say that - ctrl-a [ - move to the text you want - press space to start selection - press space to end selection - go to another screen, ctrl-a ] to paste copy mode and scrollback in gnu screen is great to quickly scan tail -f commands.