Introduction

exa is a modern replacement for the command-line program ls that ships with Unix and Linux operating systems. This command is used by terminal users, administrators, and developers hundreds of times daily, as well as being useful when writing automated scripts.

Unfortunately, these two uses are at odds with each other. While users want new features and customisation, administrators would prefer the stability of a long-lived and ubiquitous tool.

By deliberately making some decisions differently, exa attempts to be a more featureful, more user-friendly version of ls.

Bash tips: Colors and formatting (ANSI/VT100 Control sequences)

The ANSI/VT100 terminals and terminal emulators are not just able to display black and white text ; they can display colors and formatted texts thanks to escape sequences.

Those sequences are composed of the Escape character (often represented by “^[” or “<Esc>”) followed by some other characters: “<Esc>[FormatCodem”.

In Bash, the <Esc> character can be obtained with the following syntaxes:

\e
\033
\x1B

Examples:
Code (Bash) Preview

    echo -e "\e[31mHello World\e[0m"

Hello World

    echo -e "\033[31mHello\e[0m World"

Hello World

NOTE¹: The -e option of the echo command enable the parsing of the escape sequences.

NOTE²: The “\e[0m” sequence removes all attributes (formatting and colors). It can be a good idea to add it at the end of each colored text. ;)

NOTE³: The examples in this page are in Bash but the ANSI/VT100 escape sequences can be used in every programming languages.

Colourise your black and white photos

A deep learning colouriser prototype specifically for old Singaporean photos.

ColorHexa.com is a free color tool providing information about any color and generating matching color palettes for your designs (such as complementary, analogous, triadic, tetradic or monochromatic colors schemes).

Just type any color value in the search field and ColorHexa will offer a detailed description and automatically convert it to its equivalent in Hexadecimal, RGB, CMYK, HSL, HSV, CIE-LAB / LUV / LCH, Hunter-Lab, XYZ, xyY and Binary.