Master Linux File Color Codes: Customize LS_COLORS for Clearer Directory Listings

Overview

Linux terminals display file names in different colors based on their type, using the LS_COLORS environment variable. The colors help users quickly distinguish directories, symbolic links, executables, and other file categories when running the ls command.

Viewing the Current Color Scheme

You can view the current color definitions by echoing the variable: echo $LS_COLORS The output is a colon‑separated list where each entry maps a file‑type code to a set of attribute and color numbers, for example di=01;34 (directories in bold blue).

Default Configuration File

The system‑wide defaults are stored in /etc/DIR_COLORS. This file contains the same colon‑separated format and serves as the base for user customizations.

Types of Color Codes

Three categories of codes are used:

Attribute codes : range 00‑08 (e.g., 01 for bold, 04 for underline).

Text color codes : range 30‑37 and 90‑97 (e.g., 31 for red, 92 for light green).

Background color codes : range 40‑47 and 100‑107 (e.g., 44 for blue background, 106 for light turquoise).

Common File‑type Codes

di

– directory fi – regular file ex – executable ln – symbolic link so – socket bd – block device cd – character device mi – missing file *.extension – pattern for specific extensions (e.g., *.mp3, *.jpeg)

Attribute Codes

00 – None

01 – Bold

04 – Underscore

05 – Blink

07 – Reverse

08 – Concealed

Text Color Codes

30 – Black  90 – Dark grey

31 – Red   91 – Light red

32 – Green  92 – Light green

33 – Yellow 93 – Yellow

34 – Blue   94 – Light blue

35 – Magenta 95 – Light purple

36 – Cyan  96 – Turquoise

37 – White  97 – White

Background Color Codes

40 – Black  100 – Dark grey

41 – Red   101 – Light red

42 – Green  102 – Light green

43 – Yellow 103 – Yellow

44 – Blue   104 – Light blue

45 – Magenta 105 – Light purple

46 – Cyan  106 – Turquoise

47 – White  107 – White

Customizing Colors

To change a specific file‑type color, assign a new LS_COLORS string. For example, to make directories appear with an underline (code 04) and a light yellow foreground (code 93), use: LS_COLORS="di=4;93" Add this line to your ~/.bashrc (or another shell startup file) and reload the configuration:

echo "LS_COLORS=\"di=4;93\"" >> ~/.bashrc
source ~/.bashrc

After reloading, directory entries will be underlined and displayed in light yellow, confirming that the custom scheme is active.

Conclusion

The LS_COLORS variable provides granular control over how file types are colored in the Linux terminal. By understanding attribute, text, and background codes and editing ~/.bashrc, users can create personalized, high‑contrast listings that improve readability and workflow efficiency.