Screen Quick Reference

Basic

Description	Command
Start a new session with session name	`screen -S <session_name>`
List running sessions / screens	`screen -ls`
Attach to a running session	`screen -x`
Attach to a running session with name	`screen -r <session_name>`
Detach a running session	`screen -d <session_name>`
Kill a running session	`screen -X -S [session # you want to kill] kill`
Accessing a screen that is already attached	`screen -r -d [session name]`

Escape Key

All screen commands are prefixed by an escape key, by default Ctrl-a (that's Control-a, sometimes written ^a). To send a literal Ctrl-a to the programs in screen, use Ctrl-a a. This is useful when when working with screen within screen. For example Ctrl-a a n will move screen to a new window on the screen within screen.

Getting Out

Description	Command
detach	`Ctrl-a d`
detach and logout (quick exit)	`Ctrl-a D D`
exit screen	`Ctrl-a :` quit or exit all of the programs in screen.
force-exit screen	`Ctrl-a C-\` (not recommended)

Help

Description	Command
See help	`Ctrl-a ?` (Lists keybindings)

Window Management

Description	Command
Create new window	`Ctrl-a c`
Change to last-visited active window	`Ctrl-a Ctrl-a` (commonly used to flip-flop between two windows)
Change to window by number	`Ctrl-a <number>` (only for windows 0 to 9)
Change to window by number or name	`Ctrl-a ' <number or title>`
Change to next window in list	`Ctrl-a n` or `Ctrl-a <space>`
Change to previous window in list	`Ctrl-a p` or `Ctrl-a <backspace>`
See window list	`Ctrl-a "` (allows you to select a window to change to)
Show window bar	`Ctrl-a w` (if you don't have window bar)
Kill current window	`Ctrl-a k` (not recommended)
Kill all windows	`Ctrl-a \` (not recommended)
Rename current window	`Ctrl-a A`

Split screen

Description	Command
Split display horizontally	`Ctrl-a S`
Split display vertically	`Ctrl-a
Jump to next display region	`Ctrl-a tab`
Remove current region	`Ctrl-a X`
Remove all regions but the current one	`Ctrl-a Q`

Misc

Description	Command
Redraw window	`Ctrl-a C-l`
Enter copy mode	`Ctrl-a [` or `Ctrl-a <esc>` (also used for viewing scrollback buffer)
Paste	`Ctrl-a ]`
Monitor window for activity	`Ctrl-a M`
Monitor window for silence	`Ctrl-a _`
Enter digraph (for producing non-ASCII characters)	`Ctrl-a Ctrl-v`
Lock (password protect) display	`Ctrl-a x`
Enter screen command	`Ctrl-a :`
Enable logging in the screen session	`Ctrl-a H`

Scrolling

Description	Command
Enter scrolling mode	Ctrl-a esc
Scroll Up	Ctrl-u
Scroll Down	Ctrl-d
Exit scrolling mode	esc esc

This section is a contribution from: @mickpbarry

jctosta/screen_cheatsheet.markdown