GNU Emacs is primarily designed for use with the keyboard. While it is possible to use the mouse to issue editing commands through the menu bar and tool bar, that is not as efficient as using the keyboard. Therefore, this manual mainly documents how to edit with the keyboard.
Keyboard input into Emacs is based on a heavily-extended version of ASCII. Simple characters, like ‘
=’, and the space character (denoted as
SPC), are entered by typing the corresponding key. Control characters, such as
LEFT, are also entered this way, as are certain characters found on non-English keyboards (see International).
Emacs also recognizes control characters that are entered using modifier keys. Two commonly-used modifier keys are
Control (usually labeled
Meta (usually labeled
Alt)1. For example,
Control-a is entered by holding down the
Ctrl key while pressing
a; we will refer to this as
C-a for short. Similarly,
M-a for short, is entered by holding down the
Alt key and pressing
a. Modifier keys can also be applied to non-alphanumerical characters, e.g.,
You can also type Meta characters using two-character sequences starting with
ESC. Thus, you can enter
M-a by typing
ESC a. You can enter
C-M-a (holding down both
Alt, then pressing
a) by typing
ESC C-a. Unlike
ESC is entered as a separate character. You don’t hold down
ESC while typing the next character; instead, press
ESC and release it, then enter the next character. This feature is useful on certain text terminals where the
Meta key does not function reliably.
Emacs supports 3 additional modifier keys, see Modifier Keys.
On graphical displays, the window manager might block some keyboard inputs, including
C-M-l. If you have this problem, you can either customize your window manager to not block those keys, or rebind the affected Emacs commands (see Customization).
Simple characters and control characters, as well as certain non-keyboard inputs such as mouse clicks, are collectively referred to as input events. For details about how Emacs internally handles input events, see Input Events in The Emacs Lisp Reference Manual.
- We refer to
Metafor historical reasons.↩