You can quit Emacs with the following keybinding:

C-x C-c

Where C is the control key.

Suspend Emacs

You can suspend Emacs using the following keybinding :

C-z

It gets you back to your shell. If you want to resume your emacs session, enter fg in your terminal.

• Re-Save open file under the same filename (Save):

  C-x C-s

• Write as filename (Save As):

  C-x C-w filename

  _{The new file name will be prompted in the minibuffer.}

• Create new file or load existing file (New / Load):

  C-x C-f filename

  _{With the mnemonic here for f meaning file. You will be prompted for a file path in the minibuffer.}

• Visit alternate file

  C-x C-f

  _{If the file does not exist yet, you will be prompted the path of the file to create in the minibuffer.}

Often you will get into a state where you have a partially typed command sequence in progress, but you want to abort it. You can abort it with either of the following keybindings:

C-g

EscEscEsc

"Window" in Emacs refers to what might otherwise be called a "pane" or "screen division". Some window manipulation commands include:

• Split current window horizontally: C-x 2
• Split current window vertically: C-x 3
• Select next window: C-x o
• Close current window: C-x 0
• Close all other windows, except the current one: C-x 1

A "frame" in Emacs is what might otherwise be called a "window". Frames are manipulated using these commands:

• Create new frame: C-x 5 2
• Delete current frame: C-x 5 0
• Delete other frames: C-x 5 1

Switching windows can be acheived using

• S-left, S-right, S-up, S-down (that is, Shift in conjunction with an arrow key) to switch to the neighboring window in a direction, or
• C-x o to switch to the next window.

• Example of a buffer list

  CRM Buffer                Size  Mode              Filename[/Process]
  . * .emacs                3294  Emacs-Lisp        ~/.emacs
   %  *Help*                 101  Help
      search.c             86055  C                 ~/cvs/emacs/src/search.c
   %  src                  20959  Dired by name     ~/cvs/emacs/src/
    * *mail*                  42  Mail
   %  HELLO                 1607  Fundamental       ~/cvs/emacs/etc/HELLO
   %  NEWS                481184  Outline           ~/cvs/emacs/etc/NEWS
      *scratch*              191  Lisp Interaction
    * *
  Messages*            1554  Messages
  

  The first field of a line indicates:

  • ‘.’ the buffer is current.
  • ‘%’ a read-only buffer.
  • ‘*’ the buffer is modified.

• Select buffer. You can select out of any open buffer with the following keybinding:

  C-x b

  _{You will be prompted for the buffer name you wish to switch to.}

• List buffers:

  C-x C-b

• Save-some-buffer, giving the choice which buffer to save or not:

  C-x s

• Kill one buffer:

  C-x k

• Operations on marked buffers:

  S Save the marked buffers

  A View the marked buffers in this frame.

  H View the marked buffers in another frame.

  V Revert the marked buffers.

  T Toggle read-only state of marked buffers.

  D Kill the marked buffers.

  M-s a C-s Do incremental search in the marked buffers.

  M-s a C-M-s Isearch for regexp in the marked buffers.

  U Replace by regexp in each of the marked buffers.

  Q Query replace in each of the marked buffers.

  I As above, with a regular expression.

  P Print the marked buffers.

  O List lines in all marked buffers which match a given regexp (like the function `occur').

  X Pipe the contents of the marked buffers to a shell command.

  N Replace the contents of the marked buffers with the output of a shell command.

  ! Run a shell command with the buffer's file as an argument.

  E Evaluate a form in each of the marked buffers. This is a very flexible command. For example, if you want to make all of the marked buffers read only, try using (read-only-mode 1) as the input form.

  W - As above, but view each buffer while the form is evaluated.

  k - Remove the marked lines from the Ibuffer buffer, but don't kill the associated buffer.

  x - Kill all buffers marked for deletion.

• Save-some-buffer, giving the choice which buffer to save or not:

  C-x s

• Switch to the next buffer:

  C-x RIGHT

• Switch to previous buffer:

  C-x LEFT

In Emacs, basic search tool (I-Search) allows you to search after or before the location of your cursor.

• To search for sometext after the location of your cursor (search-forward) hit C-s sometext. If you want to go to the next occurence of sometext, just press C-s again (and so on for the next occurences). When cursor lands in the right location, press Enter to exit the search prompt.

• To search before the location of your cursor (search-backward), use C-r the same way you used before.

• To switch from search-backward to search-forward, press 2 times C-s. And press 2 times C-r to search backward when you're in search-forward prompt.

• Search and replace:

  M-% (or Esc-% ) oldtext Enter newtext Enter

  • Confirm: y
  • Skip: n
  • Quit: q
  • Replace all: !

• Set mark in cursor location:

  C-space or C-@

• Kill region (Cut):

  C-w

• Copy region to kill ring:

  M-w or Esc-w

• Yank (Paste) most recently killed:

  C-y

• Yank (Paste) next last killed:

  M-y or Esc-y

Kill

killis the command used by Emacs for the deletion of text. The kill command is analogous to the cut command in Windows. Various commands exist that 'kills' one word (M-d), the rest of the line (C-k), or larger text blocks. The deleted text is added to the kill-ring, from which it can later be yanked.

Select and cut (kill)

Killing and yanking Similar to the select-and-cut feature in Windows, here we have C-spc. The key binding C-spc will start the selection, the user can move the mark with the help of arrow keys or other command to make a selection. Once selection is complete - push the C-w to kill the selected text

Some basic commands which can be used as quick reference for kill command (taken from Emacs tutorial)

    M-DEL       Kill the word immediately before the cursor
    M-d         Kill the next word after the cursor

    C-k         Kill from the cursor position to end of line
    M-k         Kill to the end of the current sentence

Yank

yankdescribes the insertion of previously deleted text, e.g. using C-y which yanks the most recently killed text. Yank command is analogous to the paste command in Windows.

Yank text killed previously

We know that the kill command adds the text killed to a kill-ring. To retrieve the deleted text from the kill-ring use M-y command repeatedly until the desired text is yanked.

(Note: For the M-y key to work the previous command should be a YANK otherwise it wouldn't work)

In addition to cursor movements using the arrow keys, Home, End, Page up, and Page down, emacs defines a number of keystrokes that can move the cursor over smaller or larger pieces of text:

By character:

• Backward character: C-b
• Forward character: C-f

By word

• Backward word: M-b (i.e. Alt b, or Meta b)
• Forward word: M-f

By line:

• Beginning of current line: C-a
• Beginning of current line first(non-space)character:M-m
• End of current line: C-e
• Previous line: C-p
• Next line: C-n

Entire buffer:

• Beginning of buffer: M-<
• End of buffer: M->

By 'block', depending on context (mode):

Typical key bindings:

• Backward sentence/statement: M-a
• Forward sentence/statement: M-e
• Beginning of function: M-C-a
• End of function: M-C-e

Prefix arguments

In order to move several 'steps' at once, the movement commands may be given a prefix argument by pressing ESC or C-u and a number before the listed keystrokes. For C-u, the number is optional and defaults to 4.
E.g. ESC 3 C-n moves 3 lines down, while C-u M-f moves 4 words forward.

To undo something you just did:

C-_ or C-x u or C-/

• Capitalize word: M-c

• Convert word to upper case: M-u

• Convert word to lower case: M-l

Emacs' documentation uses a consistent notation for all key bindings, which is explained here:

Key chords

A "key chord" is obtained by pressing two or more keys simultaneously. Key chords are denoted by separating all keys by dashes (-). They usually involve modifier keys, which are put up front:

• C-: control;
• S-: shift;
• M-: alt (the "M" stands for "Meta" for historical reasons).

Other keys are simply denoted by their name, like:

• a: the a key;
• left: the left arrow key;
• SPC: the space key;
• RET: the return key.

Examples of key chords thus include:

• C-a: pressing control and a simultaneously;
• S-right: pressing shift and right simultaneously;
• C-M-a: pressing control, alt and a simultaneously.

Key sequences

"Key sequences" are sequences of keys (or key chords), which must be typed one after the other. They are denoted by separating all key (or chord) notations by a space.

Examples include:

• C-x b: pressing control and x simultaneously, then releasing them and pressing b;
• C-x C-f: pressing control and x simultaneously, then releasing x and pressing f (since both chords involve the control modifier, it is not necessary to release it).

Using ESC instead of Alt

Key chords using the Alt modifier can also be entered as a key sequence starting with ESC. This can be useful when using Emacs over a remote connection that does not transmit Alt key chords, or when these key combinations are captured e.g by a window manager.

Example:

M-x can be entered as ESC x.

Describing key bindings in Emacs lisp files

The same notation that is described here can be used when defining key bindings in Emacs lisp files.

Example:

(global-set-key (kbd "C-x C-b") 'buffer-menu)
binds the key sequence C-x C-b to the command buffer-menu