Shell Echo Color Setting.

 Using ANSI escape codes to color:

Black        0;30     Dark Gray     1;30
Red          0;31     Light Red     1;31
Green        0;32     Light Green   1;32
Brown/Orange 0;33     Yellow        1;33
Blue         0;34     Light Blue    1;34
Purple       0;35     Light Purple  1;35
Cyan         0;36     Light Cyan    1;36
Light Gray   0;37     White         1;37
No Color     0

#!/bin/bash
$ Red='\033[0;35m'
$ End='\033[0m'    #No Color.
$ echo -e "${Red}This is a Test of Red Color Characters.${End}" 
This is a Test of Red Color Characters.

#for general using, write them as functions
# Colors {{{
end="\033[0m"
red="\033[0;31m"
redb="\033[1;31m"
green="\033[0;32m"
yellow="\033[0;33m"

function red {
  echo -e "${red}${1}${end}"
}

function redb {
  echo -e "${redb}${1}${end}"
}

function green {
  echo -e "${green}${1}${end}"
}

function yellow {
  echo -e "${yellow}${1}${end}"
}
# }}} 

redb "this is a test of color  characters"
#> this is a test of color  characters

$ uname -a   # Show all OS info 
Linux flax 4.15.0-101-generic #102-Ubuntu SMP Mon May 11 10:07:26 UTC 
2020 x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release -a 
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.4 LTS
Release:        18.04
Codename:       bionic

$ man ascii
NAME
       ascii - ASCII character set encoded in octal, decimal, and hexadecimal

       The following table contains the 128 ASCII characters.

   Tables
       For convenience, below are more compact tables in hex and decimal.

          2 3 4 5 6 7       30 40 50 60 70 80 90 100 110 120
        -------------      ---------------------------------
       0:   0 @ P ` p     0:    (  2  <  F  P  Z  d   n   x
       1: ! 1 A Q a q     1:    )  3  =  G  Q  [  e   o   y
       2: " 2 B R b r     2:    *  4  >  H  R  \  f   p   z
       3: # 3 C S c s     3: !  +  5  ?  I  S  ]  g   q   {
       4: $ 4 D T d t     4: "  ,  6  @  J  T  ^  h   r   |
       5: % 5 E U e u     5: #  -  7  A  K  U  _  i   s   }
       6: & 6 F V f v     6: $  .  8  B  L  V  `  j   t   ~
       7: ' 7 G W g w     7: %  /  9  C  M  W  a  k   u  DEL
       8: ( 8 H X h x     8: &  0  :  D  N  X  b  l   v
       9: ) 9 I Y i y     9: '  1  ;  E  O  Y  c  m   w
       A: * : J Z j z
       B: + ; K [ k {
       C: , < L \ l |
       D: - = M ] m }
       E: . > N ^ n ~
       F: / ? O _ o DEL