This is a quick reference guide cheat sheet for the screen command.
$ screen
1. Press Ctrl-A D to detach session
2. List all screen sessions
$ screen -ls
3. Re-attach a screen Session
$ screen -r <name/pid>
-S — screen -S debug — Start a new session with session name
-ls — screen -ls — List running sessions / screens
-x — screen -x — Attach to a running session
-r — screen -r debug — Attach to a running session with name
-R — screen -R debug — Attach to a session (Will create if it doesn't exist)
-d — screen -d -m wget xxxx.com/large.file — Start screen in detached mode
-X — screen -X -S debug kill — Kill a running session
Ctrl-A ? — See help (Lists keybindings)
Ctrl-A C — Create new window
Ctrl-A Ctrl-A — Change to last-visited active window
Ctrl-A 0...9 — Change to window by number
Ctrl-A ' <0...9 or title> — Change to window by number or name
Ctrl-A N or Ctrl-A <space> — Change to next window in list
Ctrl-A P or Ctrl-A <backspace> — Change to previous window in list
Ctrl-A " — See window list
Ctrl-A W — Show window bar
Ctrl-A K — Kill current window (not recommended)
Ctrl-A \ — Kill all windows (not recommended)
Ctrl-A A — Rename current window
Ctrl-A D — Detach
Ctrl-A D D — Detach and logout (quick exit)
Ctrl-A : — Exit all session
Ctrl-A C-\ — Force-exit screen (not recommended)
Ctrl-A S — Split display horizontally
Ctrl-A V — Split display vertically
Ctrl-A | — Split display vertically
Ctrl-A TAB — Jump to next display region
Ctrl-A X — Remove current region
Ctrl-A Q — Remove all regions but the current one
Ctrl-A C-l — Redraw window
Ctrl-A [ — Copy mode
Ctrl-A ESC — Copy mode
Ctrl-A ] — Paste
Ctrl-A M — Monitor window for activity
Ctrl-A _ — Monitor window for silence
Ctrl-A Ctrl-V — Enter digraph (non-ASCII characters)
Ctrl-A X — Lock (password protect) display
Ctrl-A : — Enter screen command
Ctrl-A H — Enable logging in the screen session
SSH and attach in one line
$ ssh -t user@host screen -x <name/pid>