Introduction

When we download bash scripts that have been written by others in our daily work, sometimes some key strings are marked with special colors. How can this effect be achieved by writing in a script?

Font color

color code	description
30	black
31	red
32	green
33	yellow
34	blue
35	purple
36	dark green
37	white

Background color of font

background color code	description
40	black
41	crimson
42	green
43	yellow
44	blue
45	purple
46	dark green
47	white

Display mode

code	description
0	Terminal default settings
1	Highlight
4	Underline
5	Cursor blinks
7	Reverse display
8	Hide

Mode of execution

• \033[1;31;40m "1" indicates the display mode, which is optional. "31" indicates the font color. "40m" indicates the font background color

• \033[0m Restore the terminal default color, that is, cancel the color setting

Script example

We can write a script to observe the color change.

#!/bin/bash
# Font color cycle
for color1 in {31..37}
    do
        echo -e "\033[0;${color1};40m---hello! world---\033[0m"
    done

echo "-------"

# Background color cycle
for color2 in {40..47}
    do
        echo -e "\033[30;${color2}m---hello! world---\033[0m"
    done

echo "-------"

# Cycle of display mode
for color3 in 0 1 4 5 7 8
    do
        echo -e "\033[${color3};37;40m---hello! world---\033[0m"
    done

Shell > chmod a+x color_set.sh
Shell > ./color_set.sh

The effect is as follows:

Author: tianci li

Contributors: Steven Spencer