Emacs

Emacs

Emacs and its derivatives are a family of text editors that are characterized by their extensibility

Lingo

C	control key (CTRL)
M	meta key (ALT or ESC)

Quick Answers

C-x, C-f	find file
C-x, C-s	save file
C-x, C-c	exit Emacs

Cursor Motion

C-f	Move forward by a character
C-b	Move backward by a character
M-f	Move forward by a word
M-b	Move backward by a word
C-n	Move forward by a line
C-p	Move backward by a line
M-e	Move forward by a sentence
M-a	Move backward by a sentence
M-}	Move forward by a paragraph
M-{	Move backward by a paragraph
C-M-f	Move forward by an expression
C-M-b	Move backward by an expression
C-a	Move to the start of a line
C-e	Move to the end of a line
M-<	Move to the start of a buffer
M->	Move to the end of a buffer
M-g, g, #	Go to line number #

Editing

C-d	Delete a character (forward)
DEL	Delete a character (backward)
M-d	Delete a word (forward)
M-DEL	Delete a word (backward)
C-k	Delete a line (forward)
C-SPC, C-a, C-w	Delete a line (backward)
M-k	Delete a sentence (forward)
C-x, DEL	Delete a sentence (backward)
C-M-k	Delete an expression (forward)
C-M-DEL	Delete an expression (backward)

Scrolling and Windows

C-v	Page Down
M-v	Page Up
C-M-v	Page Down other window
C-x, 1	Make current window only window
C-x, 2	Split window vertically
C-x, 3	Split window horizontally
C-x, ^	Grow window vertically
C-x, o	Switch to next window
C-x, 0	Close current window

Cutting and Pasting

C-SPC	Set mark
C-w	Cut (after setting mark and moving to end point)
M-w	Copy (after setting mark and moving to end point)
C-y	Yank (paste) most recently killed (cut or copied)
M-y	Yank next most recently killed

Files and Buffers

C-x, C-f	Find file (or create if not existing)
C-x, C-s	Save file
C-x, C-w	Write file
C-x, s	Save modified buffers
C-x, b	Select buffer
C-x, C-b	List buffers
C-x, k	Kill buffer

Command-Related Stuff

ESC, ESC, ESC	Leave current location
C-u, #	Prefix numeric argument # to next command
C-g	Stop running command, or cancel partially entered command

Searching and Replacing

C-s	Incremental search forward
C-r	Incremental search backward
C-M-s	Regexp search forward
C-M-r	Regexp search backward
M-x, <replace-string>, RET	String replace from here to end of buffer
M-x, <query-replace>, RET	String replace from here to end of buffer, querying for each occurrence
M-x, <grep>, RET	Prompts for a grep command, shows hits in a buffer
C-x, `	Visit next grep hit

Help

C-h, k	Show command documentation
C-h, a	“Command apropos”
C-h, c	Show command name on message line
C-h, f	Describe function
C-h, i	Info browser

Misc

C-_	Undo/redo
C-x, u	Undo/redo (alternative)
C-q	Quoted insert
C-z	Suspend/iconify emacs (type “%emacs” to return
C-x, C-c	Exit emacs
M-x, <shell-strip-ctrl-m>, RET	Flush ^M at end of line