GNU Emacs: A Comprehensive Guide

GNU Emacs is a powerful text editor that's been around since 1981. It was created by Richard Stallman, a pioneer in the free and open-source software movement.

One of the key features of GNU Emacs is its extensibility, thanks to its Lisp programming language. This allows users to customize and extend the editor to suit their needs.

GNU Emacs is available on multiple platforms, including Windows, macOS, and Linux. Its portability is a testament to its flexibility and versatility.

With its vast array of features and customization options, GNU Emacs is an ideal choice for developers, programmers, and anyone who spends a lot of time working with text.

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Licensing under the GNU General Public License (GPL) allows Emacs source code to be freely available for examination, modification, and redistribution.

The GPL requires that any modified copy of the Emacs source code include certain text, such as instructions for obtaining GNU Emacs and Richard Stallman's essay The GNU Manifesto.

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The FSF, or Free Software Foundation, enforces the GPL by accepting significant code contributions only if the copyright holder executes a suitable disclaimer or assignment of their copyright interest.

Small contributions of fewer than 10 lines of code are exempt from this policy. This ensures the FSF can defend the software in court if its copyleft license is violated.

A notable incident in 2011 highlighted the importance of adhering to the GPL. GNU Emacs had been releasing some binaries without corresponding source code for two years, which was promptly fixed after being noticed.

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Richard Stallman is a prominent figure in the free software movement and a computer programmer and activist. He's often known by his initials "RMS".

Richard Stallman is perhaps best known for launching the GNU Project and for initiating the development of the GNU operating system. He also founded the Free Software Foundation (FSF).

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Licensing is a crucial aspect of open-source software, and GNU Emacs is no exception. The GPL states that the Emacs source code is freely available for examination, modification, and redistribution.

The licensing terms of GNU Emacs have evolved over time. Older versions of the documentation used an ad-hoc license that required the inclusion of certain text in any modified copy.

This included instructions for obtaining GNU Emacs and Richard Stallman's essay The GNU Manifesto. The XEmacs manuals, which were inherited from older GNU Emacs manuals, have the same license.

Newer versions of the documentation use the GNU Free Documentation License with "invariant sections" that require the inclusion of the same documents and proclaim themselves as GNU Manuals.

The Free Software Foundation (FSF) has a policy of accepting significant code contributions only if the copyright holder executes a suitable disclaimer or assignment of their copyright interest. This is done to ensure the FSF can defend the software in court if its copyleft license is violated.

Small contributions of fewer than 10 lines of code are exempt from this policy.

In 2011, it was noticed that GNU Emacs had been accidentally releasing some binaries without corresponding source code for two years. This was a "very bad mistake", according to Richard Stallman, which was promptly fixed.

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The FSF did not sue any downstream redistributors who unknowingly violated the GPL by distributing these binaries.

Here are some examples of software that use the GNU General Public License, similar to GNU Emacs:

The leaders and contributors behind the project are a crucial part of its success. Lars Ingebrigtsen serves as a co-maintainer.

Eli Zaretskii is also a co-maintainer, working alongside Lars to ensure the project's continued growth. Nicolas Petton, another key figure, holds the same role.

Here are the project's leaders and contributors:

Emacs is a powerful text editor that can be customized to fit your needs. It's been around since 1981 and is still widely used today.

One of the key features of Emacs is its ability to handle multiple buffers at once, allowing you to work on multiple files simultaneously. This is especially useful for developers who need to switch between multiple code files.

Emacs also has a built-in Lisp interpreter, which makes it easy to extend and customize the editor. With Emacs, you can write your own functions and macros to automate tasks and improve your workflow.

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Emacs is a highly customizable editor, with thousands of packages available to extend its functionality.

You can customize Emacs to fit your needs by using its built-in customization system, which allows you to configure almost every aspect of the editor.

Emacs has a vast collection of packages, including the popular Org mode, which is a powerful tool for note-taking and task management.

The keybinding system in Emacs is highly flexible, allowing you to assign custom keybindings to your favorite commands and functions.

Emacs has a strong focus on keyboard navigation, with many commands available for moving around the buffer, editing text, and manipulating windows.

The built-in help system in Emacs is incredibly useful, providing detailed documentation and examples for every command and function.

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Quitting Emacs is a straightforward process. Press C-x C-c (Control-x followed by Control-c) to prompt Emacs to save any unsaved buffers before closing.

If all buffers are saved, Emacs will exit without any issues. However, if you have unsaved buffers, Emacs will remind you to save them before closing.

To avoid losing any work, make sure to save all your buffers before quitting. This ensures that your data is preserved and can be easily recovered later.

Pressing C-x C-c again will confirm your decision to exit Emacs.

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GNU Emacs has a vast vocabulary of commands that can be invoked using modified keystrokes. These keystrokes can be as simple as the arrow keys or as complex as a combination of keys, including the control key, meta key, and shift key.

In Emacs, commands can be bound to keystrokes for convenient editing. This pairing of keystroke and command is called a key binding. The set of all bindings makes up the Emacs command set, which can be customized and extended.

Emacs users can invoke commands by typing their long names, which can be looked up in the documentation. The command language recognizes various shift and modifier keys, including Ctrl, Alt, Shift, Meta, Super, and Hyper. These keys are represented in command language using prefixes such as C-, A-, S-, M-, s-, and H-.

To type characters that are not available on the keyboard, Emacs uses the Meta key. The Meta key generates the same character as the key it's used with, but with the high-order bit set. This allows users to access characters such as M-a and M-b.

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Emacs also supports external processes, which can be used to implement features like shell-mode and REPL modes for programming languages. Users can configure their keyboard layout to use the IBM Common User Access layout with the cua-mode package.

The Emacs command language is concise and expressive, making it easier to perform actions without memorizing complex keystrokes. Users can look up the long name of a command and type it directly using the M-x command. This feature is especially useful for users who prefer to learn new commands as they need them.

Here's a summary of the shift and modifier keys recognized by Emacs:

Note that not all of these keys may be present on an IBM-style keyboard, but they can be configured as desired.

The minibuffer is a crucial part of the Emacs experience, and it's worth understanding how it works.

The minibuffer is located at the bottommost line of the Emacs screen and is used to display messages and request information, much like dialog boxes in GUI editors.

You can see the minibuffer in action when you're performing a search, where it will hold the text you're targeting. You can also use it to name a file you want to read or save.

Command-line completion is available in the minibuffer using the tab and space keys, making it easier to find what you're looking for.

If you type a multi-character keystroke, like ESC q, with a long pause between keystrokes, Emacs will echo the keystrokes in the minibuffer, giving you a chance to see what you're typing.

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File Management is a breeze with GNU Emacs. You can easily manage your files by using the built-in Dired mode, which allows you to navigate and edit your files in a directory-based interface.

Dired mode provides a lot of features, including the ability to rename files, delete files, and create new directories.

One of the most useful features of Dired mode is its ability to perform file operations on multiple files at once, saving you time and effort.

File management is a crucial aspect of computer literacy. It helps keep your digital life organized and clutter-free.

You should regularly back up your important files to an external hard drive or cloud storage. This will prevent data loss in case your computer crashes or is stolen.

A good rule of thumb is to save your files in a clear and descriptive manner, using names that accurately reflect their contents. This will make it easier to find specific files later.

Cloud storage services like Google Drive, Dropbox, and OneDrive offer a convenient way to store and access your files from anywhere. They also provide automatic backups and collaboration features.

Organizing your files into folders and subfolders can greatly improve your productivity and reduce stress. This will help you quickly locate specific files and avoid wasting time searching for them.

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List Buffers is a powerful tool in Emacs that allows you to view and switch between all available buffers.

To access the List Buffers, press C-x C-b (Control-x followed by Control-b). This opens a buffer list in a new window, showing all available buffers.

You can navigate through the list using the arrow keys or n (next) and p (previous). This makes it easy to find and switch to the buffer you need.

Press Enter to switch to the highlighted buffer. This will instantly switch you to the selected buffer, allowing you to work on the desired file or task.

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Deleting text in your file can be a bit tricky, but it's essential to understand how it works. The kill ring holds the last 30 kills by default, but you can change this to any number you like by altering the kill-ring-max variable.

You can delete text, but it's not gone forever. The text is saved on the kill ring, and you can yank it back later.

If you delete text, it will be replaced by the next thing you delete. This is because the kill ring acts like a fifo, or first-in-first-out, queue when you're killing things.

However, when you yank text back, it's a different story. The kill ring acts like a ring, so you can yank around the ring circularly and retrieve text that's been deleted.

The amount of text you can save in the kill ring is virtually unlimited, but the number of distinct kills is capped at the value of kill-ring-max.

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GNU Emacs offers a wide range of customization options through its modes and minor modes. Major modes allow the editor to adapt to different types of text, such as programming languages, markup languages, and web pages, by extending its behavior with Emacs Lisp programs.

Major modes typically provide features like syntax highlighting, automatic indentation, and special editing commands. For example, the C programming language major mode defines a separate minor mode for each of its popular indent styles.

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Minor modes can operate simultaneously with a major mode and provide additional functionality, such as undoing changes to the window configuration or performing on-the-fly syntax checking. Some minor modes can even allow multiple major modes to be used in a single file.

Here are some examples of notable minor modes:

GNU Emacs is incredibly customizable, with a range of features that allow users to tailor the editor to their specific needs. This is largely due to its extensibility, which enables users to add new commands, modes, and keymaps.

One of the most powerful tools for customizing Emacs is the ability to record and replay macros. This allows users to automate complex, repetitive tasks and save time in the long run.

Emacs also allows users to save and invoke macros later, making it a convenient feature for tasks that need to be performed regularly. This is especially useful for tasks that involve a lot of repetitive typing or editing.

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The customize extension is another key feature that makes it easy to customize Emacs. It allows users to set configuration properties such as the color scheme interactively, from within Emacs.

The customize extension offers a range of features, including search, descriptions, and help text, making it easy to find and configure the settings you need. It also allows users to revert to defaults and modify the running Emacs instance without reloading.

Emacs has a range of themes that can be used to customize the appearance of the editor. These themes are defined as Emacs Lisp files and can be chosen through the customize extension.

Here are some examples of modes that support editing different types of files:

These modes change fonts to highlight the code and keybindings to make editing easier. They also support editing spreadsheets and structured text.

Categories can be broadly classified into three main types: game modes, character customization, and graphical settings.

Game modes include single-player, multiplayer, and co-op, each offering a unique experience.

Single-player mode allows for a more personal and immersive experience, with the ability to play through the game's storyline at your own pace.

Multiplayer mode, on the other hand, enables you to play with friends or other players online, adding a social aspect to the game.

Co-op mode allows for two or more players to work together to complete levels or missions.

Character customization allows you to personalize your character's appearance, including their skin tone, hair style, and clothing.

You can also choose from a variety of accessories, such as hats, glasses, and jewelry, to give your character a unique look.

Graphical settings include options for resolution, graphics quality, and anti-aliasing, which can greatly impact the game's performance and visual quality.

GNU Emacs is incredibly extensible, thanks to its ability to incorporate Emacs Lisp programs that define new commands, keymaps, and modes. This means users can add almost any feature they need.

The built-in package manager, introduced in version 24, makes it easy to search for and install new packages. Historically, packages were downloaded manually, but now they can be retrieved from ELPA repositories, including the one run by the GNU Project.

Some notable packages include AUCTeX for editing TeX and LaTeX documents, Dired for file management, and Eshell for a command line shell. These packages can be installed with a few clicks, and they often provide a more integrated experience than running external tools.

Emacs's performance has also improved over the years, with modern computers able to run it with ease. Even older versions of Emacs, like 32-bit versions after 23.2, can edit files up to 512 MB in size. And with native compilation of Emacs Lisp files via libgccjit, starting from version 28.1, performance has seen a significant boost.

GNU Emacs is a powerhouse of extensibility, with a wide range of customization options available. The behavior of Emacs can be modified and extended almost without limit by incorporating Emacs Lisp programs.

Since version 24, Emacs includes a built-in package manager that allows users to search for and install packages. This has made it much easier to add new functionality to Emacs.

Many popular packages have been included in Emacs by default over time, such as Org-mode, Calc, and TRAMP. Some notable packages include AUCTeX, Dired, and Eshell.

Here are some notable packages and their features:

Emacs also has a built-in package manager that allows users to easily install and manage packages. This has made it much easier for users to add new functionality to Emacs.

GNU Emacs has come a long way in terms of performance since its early days. Modern computers can run it with ease, but older versions had limitations.

Prior to 1995, GNU Emacs couldn't edit files larger than 8 MB. This limitation was raised in successive versions, and 32-bit versions after GNU Emacs 23.2 can edit files up to 512 MB in size.

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Emacs compiled on a 64-bit machine can handle much larger buffers. This is a significant improvement for users who work with large files.

GNU Emacs makes extensive use of natively compiled C code to improve performance. This helps to reduce the overhead of loading and interpreting Lisp-based code.

The use of external libraries like libxml2 for parsing XML also contributes to its performance. This allows Emacs to leverage the power of specialized libraries without sacrificing performance.

Since version 28.1, Emacs can natively compile Emacs Lisp files via libgccjit, resulting in a significant boost in performance. This means that users can expect faster loading times and improved overall responsiveness.

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Mike McMahon and Daniel Weinreb wrote EINE, an Emacs-like editor for the Lisp machine, in the following years. It was the first Emacs written in Lisp.

Weinreb's EINE was later maintained by Richard Soley, who went on to develop the NILE Emacs-like editor for the NIL Project. Barry Margolin also maintained Multics Emacs, which was written by Bernard Greenberg in 1978.

James Gosling wrote Gosling Emacs in 1981, a Lisp-like editor that ran on Unix. It was written in C and used Mocklisp as an extension language.

CCA EMACS was originally based on Warren Montgomery's EMACS, but was gradually rewritten. It was written to emulate the original PDP-10 EMACS (written by Richard Stallman) as closely as possible, while adding many new commands.

GNU Emacs has been around for a while, and over time, it has branched out into various forks that cater to different needs and platforms.

One notable fork is Aquamacs, which focuses on integrating with the Apple Macintosh user interface. It's based on GNU Emacs version 24 and 25, and it's a great option for Mac users who want a seamless editing experience.

Meadow is another fork that's worth mentioning. It's a Japanese version of GNU Emacs for Microsoft Windows, which was ported from UNIX-based operating systems with some added functions.

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Here are some of the other notable forks:

These forks show the flexibility and adaptability of GNU Emacs, and they're definitely worth exploring if you're looking for a specific feature or platform support.

GNU Emacs was first released in 1985 with version 13, marking a significant milestone in its development history. This version was made publicly available on March 20, 1985.

The first widely distributed version of GNU Emacs was version 15.34, released later in 1985. It's interesting to note that early versions of GNU Emacs were numbered as "1.x.x", with the initial digit denoting the version of the C core.

A new numbering scheme was introduced, with a number with two components signifying a release version, and development versions having three components. This change allowed for more flexibility in the development process.

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The first public release of GNU Emacs was version 13, made on March 20, 1985.

Version 15.34 was the first widely distributed version of GNU Emacs, released later in 1985.

The initial version numbering scheme used a "1.x.x" format, with the first digit denoting the C core version, but this was dropped after version 1.12.

The current numbering scheme uses a two-component number for release versions and a three-component number for development versions.

GNU Emacs was later ported to the Unix operating system, where it offered more features than Gosling Emacs and soon replaced it as the de facto Unix Emacs editor.

Early versions of GNU Emacs had a security flaw exploited by Markus Hess in his 1986 cracking spree, which gave him superuser access to Unix computers.

In 1999, the project adopted a public development mailing list and anonymous CVS access, marking a shift from the "Cathedral" development style.

Development took place in a single CVS trunk until 2008, and today uses the GitDVCS.

Richard Stallman has remained the principal maintainer of GNU Emacs, but has stepped back from the role at times, with Stefan Monnier and Chong Yidong overseeing maintenance from 2008.

John Wiegley was announced as the new maintainer in 2015, and Eli Zaretskii joined him in 2016, with Lars Ingebrigtsen joining in 2020.

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The latest version of Emacs is version 30.1, which was released on February 23, 2025.

You can download the stable version of Emacs 30.1 from the official GNU FTP server at https://ftp.gnu.org/gnu/emacs/emacs-30.1.tar.gz.

To verify the integrity of the download, you can check the OpenPGP signature URL: https://ftp.gnu.org/gnu/emacs/emacs-30.1.tar.gz.sig.

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GNU Emacs is primarily a text editor, but it can also format and print documents like a word processor by interfacing with external programs. It's capable of manipulating pieces of text in real-time, displaying edits onscreen as they occur.

Emacs provides commands to manipulate and display semantic units of text such as words, sentences, paragraphs, and source code constructs. This includes keyboard macros for performing user-defined batches of editing commands.

GNU Emacs uses a stable core of basic services and platform abstraction written in the C programming language. This allows the editor to be ported to various operating systems and architectures without modifying the implementation semantics of the Lisp system.

GNU Emacs has support for many alphabets, scripts, writing systems, and cultural conventions.

It also provides spell-checking for many languages by calling external programs such as ispell.

Version 24 added support for bidirectional text and left-to-right and right-to-left writing direction for languages such as Arabic, Persian and Hebrew.

Many character encoding systems, including UTF-8, are supported by GNU Emacs.

GNU Emacs uses UTF-8 for its encoding as of version 23, while prior versions used their own encoding internally and performed conversion upon load and save.

The internal encoding used by XEmacs is similar to that of GNU Emacs but differs in details.

The GNU Emacs user interface originated in English and, with the exception of the beginners' tutorial, has not been translated into any other language.

A subsystem called Emacspeak enables visually impaired and blind users to control the editor through audio feedback.

Emacs is primarily a text editor, designed for manipulating pieces of text.

It's capable of formatting and printing documents like a word processor by interfacing with external programs such as LaTeX, Ghostscript, or a web browser.

Emacs provides commands to manipulate and differentially display semantic units of text such as words, sentences, paragraphs, and source code constructs such as functions.

Keyboard macros in Emacs allow users to perform user-defined batches of editing commands.

GNU Emacs is a real-time display editor, displaying edits onscreen as they occur.

This was a groundbreaking feature, as it was among the earliest to implement this standard behavior for modern text editors.

Emacs has a unique architecture that sets it apart from other editors.

The majority of Emacs' functionality, including basic editing operations, is achieved through functions written in Emacs Lisp, a dialect of the Lisp programming language.

Emacs Lisp sits atop a stable core of basic services and platform abstraction written in C, which allows Emacs to be ported to various operating systems and architectures without modifying the implementation semantics of the Lisp system.

This Lisp environment enables variables and functions to be modified without rebuilding or restarting Emacs, with newly redefined versions of core editor features being asynchronously compiled and loaded into the live environment.

Emacs features both bytecode and native code compilation for Emacs Lisp.

All configuration is stored in variables, classes, and data structures, and changed by simply updating these live.

The use of a Lisp dialect is a key advantage, as Lisp syntax consists of symbolic expressions (or sexprs) that can act as both evaluatable code expressions and data serialisation format.

This allows customising existing features and writing new ones to be accomplished in the same basic way.

Emacs' open design exposes its internals to the user during normal use, collapsing the distinction between using Emacs and programming Emacs.

The goal of Emacs' design is to provide a stable, practical, and responsive editing environment for novice users.

To start incremental search in Emacs, simply press C-s (Control-s).

As you type the search string, Emacs will highlight the first occurrence of the text.

You can navigate to the next occurrence by pressing C-s again, and to the previous occurrence by pressing C-r.

To exit the search, press Enter to leave the cursor at the current match, or C-g to cancel the search and return to the original position.

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Emacs' display elements don't belong to any specific data or process, meaning buffers aren't tied to windows, and multiple windows can be opened onto the same buffer.

In Emacs, buffers are the data you interact with, and they're displayed inside windows, which are tiled portions of the terminal screen or GUI window, referred to as frames.

Multiple buffers can share the same text, for example, to take advantage of different major modes in a mixed-language file.

A common usage pattern is to deploy Emacs as an editing server: running it as a headless daemon and connecting to it via a frame-spawning client.

Running Emacs processes don't require any frames, and one such server can be made available in any situation where an editor is required, simply by declaring the client program to be the user's EDITOR or VISUAL variable.

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Infinite Redo is a game-changer for any editor.

You can reverse direction while undoing, thereby undoing the undo.

This feature is especially useful when you've accidentally undone something you didn't mean to.

It allows you to undo a long chain of commands, not just one previous one, even undoing through saves.

With practice, you'll be laughing at any editor that doesn't have this feature.

Reading the undo section of the manual carefully and practising will get you comfortable with undo in no time.

Interactive Data is a game-changer for editing and navigation. It allows users to engage with data in a more meaningful way, making it easier to understand and analyze.

With interactive data, users can filter and sort data in real-time, giving them instant access to the information they need. This feature is particularly useful when working with large datasets, as it saves time and reduces the risk of human error.

Interactive data visualizations can be customized to meet specific needs, such as changing colors, fonts, or layouts. This level of control enables users to communicate complex information in a clear and concise manner.

According to the article, interactive data can be used to create interactive maps, which can be zoomed in and out of, as well as panned and hovered over to reveal more information. This feature is especially useful for geographic data, making it easier to understand spatial relationships and patterns.

Yanking is a powerful feature in text editing that allows you to retrieve previous kills from the kill ring.

To get started, press C-y to grab the most recent kill. This will replace the current text with the last thing you deleted or cut.

Searching and replacing is an essential part of editing, and Emacs makes it easy with its incremental search commands. You can search forward and backward using C-s and C-r respectively, and Emacs will highlight the first occurrence of the search string as you type.

To search non-incrementally, you can type C-s RET text RET, where text is the text to search for. This can be useful if you need to search for a specific phrase or word.

Emacs also has a word search feature that lets you search for a sequence of one or more words, regardless of how they're separated. To invoke word search, type C-s RET C-w word word word RET.

You can navigate matches by pressing C-s to find the next occurrence, and C-r to move to the previous occurrence.

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S-Expressions are a great tool for editing most programming languages, they move you around quickly and accurately.

They also help spot syntax errors while you're editing, because they'll generate an error if your parens or quotes are unbalanced.

This feature is fantastic for catching mistakes on the fly, saving you time and frustration in the long run.

Emacs can also search incrementally by regular expressions, but that's a feature too complex to describe here.