An extensible, customizable, free/libre text editor — and more. At its core is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing.

The reason for GNU Emacs's existence is to provide a powerful editor for the GNU operating system. Versions of GNU, such as GNU/Linux, are the primary platforms for Emacs development.

Emacs is the advanced, extensible, customizable, self-documenting editor. This manual describes how to edit with Emacs and some of the ways to customize it; it corresponds to GNU Emacs …

There is a special major mode for editing binary files: Hexl mode. To use it, use M-x hexl-find-file instead of C-x C-f to visit the file. This command converts the file’s contents to hexadecimal …

Basic Editing Commands. We now give the basics of how to enter text, make corrections, and save the text in a file. If this material is new to you, you might learn it more easily by running …

Aborting exits a recursive editing level and cancels the command that invoked the recursive edit (see Recursive Editing Levels). Quitting with C-g is the way to get rid of a partially typed …

8 Exiting Emacs C-x C-c. Kill Emacs (save-buffers-kill-terminal).C-z. On a text terminal, suspend Emacs; on a graphical display, iconify (or “minimize”) the selected frame (suspend …

If Emacs is about to save a file and sees that the date of the latest version on disk does not match what Emacs last read or wrote, Emacs notifies you of this fact, because it probably indicates a …

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1.4 The Menu Bar. Each Emacs frame normally has a menu bar at the top which you can use to perform common operations. There’s no need to list them here, as you can more easily see …