Exercise 2: Running a Command and Capturing the Result Remotely — Possible Solution
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  $ screen -dmS work                             # if it doesn't exist yet
  $ screen -S work -p 0 -X stuff $'ls -l ~\n'    # type the command + Enter
  $ sleep 1                                      # give it a moment to run
  $ screen -S work -p 0 -X hardcopy /tmp/work.txt
  $ cat /tmp/work.txt

/tmp/work.txt contains what window 0 is displaying: the prompt, the
ls -l command, and its output.

Notes:

  - The newline in $'ls -l ~\n' is what "presses Enter". Without it,
    the text just sits on the command line.
  - The short sleep matters: stuff returns immediately, before the
    command has finished, and hardcopy only captures what's on screen
    at that moment.
  - hardcopy captures the visible screen only. For long output, use
    logging (Ctrl-a H or -L) instead.

WHY THIS WORKS AS AN ANSWER
------------------------------
It pairs stuff (input) with hardcopy (output) to control a window
completely from outside, and explains the timing and screen-size
limits that often catch people out.