Emacs

GNU Emacs was originally implemented in 1976 on the MIT AI Lab’s Incompatible Timesharing System (ITS), as a collection of TECO macros. The name “Emacs” was originally chosen as an abbreviation of ‘Editor MACroS’. This version of Emacs, GNU Emacs, was originally written in 1984.

Shell

M-x shell
M-x eshell

Compile

M-x compile

Debug

M-x gdb

Grep

M-x grep

Man

M-x man

Diff

M-x ediff

FIle manager

M-x dired

Read news, mail and feeds

M-x gnus

Games

M-x doctor
M-x tetris
M-x snake
M-x 5x5
M-x blackbox
M-x decipher
M-x dissociated-press
M-x dunnet
M-x hanoi
M-x landmark
M-x life
M-x morse-region
M-x mpuz
M-x pong
M-x snake
M-x solitaire
M-x studlify-region
M-x zone

IRC

M-x irc

Invoking shell commands

M-x shell-command or M-!

Tools

M-x calculator
M-x calendar
M-x phases-of-moon

Version control

M-x vc-next-action or C-x v v

Help

C-h t
C-h r
C-h C-f

Moving in buffers

Key Meaning
C-f Forward one character
C-n Next line
C-b Back one character
C-p Previous line
C-a Beginning of line
M-f Forward one word
M-a Previous sentence
M-v Previous screen
M-< Beginning of buffer
C-e End of line
M-b Back one word
M-e Next sentence
C-v Next screen
M-> End of buffer
C-u 3 C-p Back 3 lines
C-u 10 C-f Forward 10 characters
M-1 M-0 C-f Forward 10 characters
C-u C-n Forward 4 lines
C-u C-u C-n Forward 16 lines
C-u C-u C-u C-n Forward 64 lines
M-g g Jump to specified line
C-s Incremental search forward
C-r Incremental search backward

Mark

Key Meaning
C-SPC Set mark to the current location
C-x C-x Swap point and mark
C-u C-SPC Cycle through mark ring

Region

Key Meaning
C-x h Make region contain the entire buffer (‘Select all’)
M-h Make region contain the current paragraph
C-x n n Narrow buffer to the current region
C-x n w Restore (‘widen’) buffer

Killing (‘cutting’) text

Key Meaning
C-k Kill line
C-u 10 C-k Kill 10 lines
C-w Kill region (‘cut’)
M-w Save region to kill ring without deleting (‘copy’)
M-d Kill next word
M-k Kill to end of sentence

Yanking (‘pasting’) text

Key | Meaning —-|——– C-y ! Yanks last killed text M-y | Replace yanked text with previously killed text

Undo

Key Meaning
C-/ Undo
C-_ Undo
C-x u Undo
Key Meaning
C-s Incremental search
C-s C-s Search for most recently searched item
C-s M-p Previous item in search history
C-s M-n Next item in search history
C-h k C-s Guide to more commands available in incremental search
C-r Backward incremental search

Search and replacement

Key Meaning
M-% Query replace

Add symbols

Key Meaning
C-x 8 C-h Help to add symbols
Key Meaning
C-M-s Regular expression incremental search

Keyboard Macros

Key Meaning
F3 Start recording macro
F4 Stop recording macro
F4 Play back macro once
M-5 F4 Play back macro 5 times
M-0 F4 Play back macro over and over until it fails

My ~/.emacs.d/init.el

;;; Emacs is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Emacs is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Emacs.  If not, see <http://www.gnu.org/licenses/>.
;;;
;;; Emacs --- Emacs config
;;; Copyright 2000-2017 Daniel Pimentel <d4n1@d4n1.org>
;;;
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Emacs.  If not, see <http://www.gnu.org/licenses/>.

;; Emacs
(package-initialize)
(custom-set-variables
 '(custom-enabled-themes (quote (wombat)))
 '(font-use-system-font t)
 '(horizontal-scroll-bar-mode nil)
 '(inhibit-startup-screen t)
 '(initial-scratch-message "Welcome to the Emacs

~$ ")
 '(menu-bar-mode nil)
 '(scroll-bar-mode nil)
 '(tool-bar-mode nil))
(custom-set-faces
 '(cursor ((t (:background "red")))))
(setq column-number-mode t)
(if (window-system) (set-frame-size (selected-frame) 39 12))

;; Org-mode
(global-set-key "\C-cl" 'org-store-link)
(global-set-key "\C-ca" 'org-agenda)
(global-set-key "\C-cc" 'org-capture)
(global-set-key "\C-cb" 'org-iswitchb)

;; Path
(add-to-list 'load-path "~/.emacs.d/elisp")

GNU Emacs