Does Linux come with emacs?

Linux does not come with emacs; emacs is an integrated development environment and text editor. Because vim is smaller in size than emacs, most Linux distributions come with vim as their own editor; emacs also You can install it yourself, the syntax is "apt-get install emacs".

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

emacs in Linux

Linux does not come with emacs

Emacs, a famous integrated development environment and text editor. Emacs is recognized as one of the most popular code editors for professional programmers, along with vim.

The installation volume of emacs is about 300M,

The installation volume of vim is more than 3m, and its predecessor vi is about 300kb

Just for this reason, emacs is not suitable for built-in , the maximum size of a CD at that time was only a few hundred megabytes. To put other things in the distribution into it, adding emacs was obviously not enough; The bandwidth and traffic costs in those days are completely incomparable with today's. Even today's various desktop distributions are only 1 to 2 G. Emacs can be installed by itself, and there is no need to build it in. In addition, emacs needs to perform a lot of tasks to start. Startup code, so startup is slow and takes up more memory;

Extended knowledge:

Syntax

 emacs(选项)(参数)

Options

: Start the emacs editor and move the cursor to the line with the specified line number;

-q: Start the emacs editor without loading the initialization file;

-u: Start emacs editing When starting the emacs editor, load the initialization file of the specified user;

-t: When starting the emacs editor, use the specified file as the middle end, and standard input (stdin) and standard output (stdout) are not applicable;

-f: Execute the specified lisp (programming language widely used in the field of artificial intelligence) function;

-l: Load the specified lisp code file;

-batch: Batch processing mode to run the emacs editor.

Parameters

File: Specify the text file to be edited.

Example

Make Emacs modifier keys more meaningful

On the PC keyboard, the Ctrl key is called C, and the Alt key is Called M, these keys are not C and M keys and are easily identifiable in documents since they are always paired with the corresponding letter or symbol key.

For example, C-x means Ctrl X and M-x means Alt X in modern keyboard notation. Just like when you cut text from any application, press both keys at the same time.

There's another level of keyboard shortcuts, though, that's completely different from anything you'll find on a modern computer. Sometimes a keyboard shortcut isn't just a key combination, but a series of keys.

For example, C-x C-f means pressing Ctrl X and then Ctrl C as usual.

Sometimes, a keyboard shortcut has mixed key types. The key combination C-x 3 means pressing Ctrl X then the 3 key as usual.

The reason Emacs can do these fancy power combinations is because certain keys cause Emacs to enter a special command mode. If you press C-X (i.e. Ctrl X), you tell Emacs to enter an idle state and wait for a second key or keyboard shortcut.

Emacs documentation, both official and unofficial, has many keyboard shortcuts. Practice mentally translating the C key to the Ctrl key and the M key to the Alt key, and the documents will start to make more sense to you.

Recommended learning:

Linux video tutorial

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