Introduction to Emacs | 02x00.03-02

Emacs is not just a text editor; it is a powerful tool that can revolutionize the way you interact with your computer. This article will guide you through the basics of Emacs, including its history, fundamental concepts, and essential commands that every user should know. Whether you are a beginner or looking to refresh your knowledge, this guide will help you get the most out of Emacs.

What is Emacs

Emacs is a highly customizable and extensible text editor. It is known for its powerful editing features and the ability to be tailored to the user's specific needs. Emacs is more than just a text editor; it is often referred to as an "operating system" for editing text due to its wide range of capabilities, including text manipulation, file management, and even web browsing.

Who is Richard Stallman

Richard Stallman is an American free software movement activist and programmer. He launched the GNU Project to create a free Unix-like operating system and is the founder of the Free Software Foundation. Stallman developed the original version of Emacs, known as GNU Emacs, which has become one of the most popular versions of Emacs.

How to Open and Save Files

To open a file in Emacs, use the command:

C-x C-f

This will prompt you to enter the file name or path. To save a file, use the command:

C-x C-s

If you want to save the file under a different name, use:

C-x C-w

and enter the new file name.

What is a Buffer and How to Switch from One to Another

In Emacs, a buffer is an area of memory where text is held. Each open file is associated with its own buffer. To switch between buffers, you can use the command:

C-x b

and enter the name of the buffer you want to switch to. You can also use:

C-x C-b

to list all open buffers and switch to one from the list.

How to Use the Mark and the Point to Set the Region

The "point" is the current position of the cursor in the buffer, and the "mark" is a position that you set to define a region of text. To set the mark, use:

C-SPC

The region is the text between the point and the mark. You can perform operations on this region, such as cutting, copying, or pasting.

How to Cut and Paste Lines and Regions

To cut (or "kill") a region of text, set the mark at the beginning of the region, move the point to the end, and use:

C-w

To paste (or "yank") the text, move the point to the desired location and use:

C-y

To copy (or "kill-ring-save") a region without deleting it, use:

M-w

(Meta-w, often mapped to Alt-w).

How to Search Forward and Backward

To search forward in the text, use the command:

C-s

and enter the search term. Emacs will highlight the occurrences as you type. To search backward, use:

C-r

and enter the search term.

How to Invoke Commands by Name

In Emacs, you can invoke commands by their name using:

M-x

(Meta-x, often mapped to Alt-x). After typing M-x, you can enter the name of the command you want to execute. For example, to save all buffers, you can type:

M-x save-some-buffers

How to Undo

To undo the last change, use the command:

C-/

or:

C-x u

(Control-x followed by u). You can continue to undo previous changes by repeating the command.

How to Cancel Half-entered Commands

If you start entering a command and want to cancel it, use:

C-g

This will abort the current command and return Emacs to its normal state.

How to Quit Emacs

To quit Emacs, use the command:

C-x C-c

Emacs will prompt you to save any unsaved buffers before exiting.

Conclusion

Emacs is a versatile and powerful tool for text editing and more. By mastering the basic commands and understanding its core concepts, you can greatly enhance your productivity. Remember, Emacs is highly customizable, so you can adapt it to fit your specific needs and workflow. As you continue to explore Emacs, you'll discover even more features and capabilities that make it an indispensable tool for many programmers and writers.