One of the easiest ways to boost the readability and context of the text in a configuration file or your source code for various programing languages, is by using a text editor that supports “syntax highlighting”.

Syntax highlighting is a simple but useful component in most if not all text editors that are used for programming, scripting, or markup languages, which enables for displaying colored text, notably source code, in different colors (and possibly fonts) corresponding to the category of terms.

Read Also: 10 Reasons Why You Should Use Vi/Vim Text Editor in Linux

In this article, we will show how to turn on syntax highlighting temporarily or permanently in Vi/Vim text editor.

VIM is an alternative and advanced version of VI editor that enables Syntax highlighting feature in VI. Syntax highlighting means it can show some parts of text in another fonts and colors. VIM doesn’t show whole file but have some limitations in highlighting particular keywords or text matching a pattern in a file. By default VIM works on all Linux terminals, but some terminals have minimal highlighting capabilities to run.

VIM has another great feature that enable us to Turn Off or Turn On syntax highlighting using option syntax on and syntax off.

How to Install VIM

Most of the Linux system already included VIM package, if not then install it using YUM tool.

# yum -y install vim-enhanced

How to Enable Syntax Highlighting in VI and VIM

To enable Syntax Highlighting feature in VI editor, open the file called /etc/profile.

# vi /etc/profile

Add the alias function to VI by pointing to VIM in /etc/profile file. This file is used to set alias functions globally.

alias vi=vim

If you would like to set user specific aliases and functions, then you need to open the file .bashrc under user directory.

# vi /home/tecmint/.bashrc

Add the alias function. For example we set alias for tecmint user.

alias vi=vim

After making changes to file you need to reset the changes by executing following command.

# source /etc/profile
OR
# source /home/tecmint/.bashrc

Test Syntax Highlighting in Vi Editor

Open any example code of file with vi editor. By default Syntax Highlighting is automatically turned on in /etc/vimrc file.

Example of Syntax Highlighting in VI

Syntax Highlighting in Vi

Turn On or Turn Off Syntax Highlighting in VI

You can Turn On or Turn Off syntax highlighting by pressing ESC button and use command as :syntax on and :syntax off in Vi editor. Refer example screenshots.