On peut utiliser les couleurs en bash.

http://misc.flogisoft.com/bash/tip_colors_and_formatting

#!/bin/bash

#---------------------------------------------------------------------------
# Attribute codes:
# 00=none 01=bold 02=low 03=Italic 04=underscore 05=blink 07=reverse 08=concealed 
# 21=reset bold 22=reset dim 23=reset Italic 24=reset underscore 25=reset blink 27=reset reverse 28=reset hidden 
#
# Text color codes:
# 30=black 31=red 32=green 33=yellow 34=blue 35=magenta 36=cyan 37=white
#
# Background color codes:
# 40=black 41=red 42=green 43=yellow 44=blue 45=magenta 46=cyan 47=white
#---------------------------------------------------------------------------

endColor='\e[0m'
reverse='\e[7m'
italic='\e[3m'
boldItalic='\e[1;3m'
bold='\e[1m'
black='\e[0;30m'
boldBlack='\e[1;30m'
red='\e[0;31m'
lowRed='\e[2;31m'
boldRed='\e[1;31m'
green='\e[0;32m'
lowGreen='\e[2;32m'
boldGreen='\e[1;32m'
yellow='\e[0;33m'
boldYellow='\e[1;33m'
lowYellow='\e[2;33m'
blue='\e[0;34m'
lowBlue='\e[2;34m'
boldBlue='\e[1;34m'
magenta='\e[0;35m'
boldMagenta='\e[1;35m'
cyan='\e[0;36m'
boldCyan='\e[1;36m'
white='\e[0;37m'
lowWhite='\e[2;37m'
boldwhite='\e[1;37m'

blueOnYellow='\e[0;34;43m'
boldBlueOnYellow='\e[1;34;43m'
blueOnWhite='\e[0;34;47m'
boldBlueOnWhite='\e[1;34;47m'
whiteOnBlack='\e[0;37;40m'
boldwhiteOnBlack='\e[1;37;40m'
blackOnWhite='\e[0;30;47m'
boldBlackOnWhite='\e[1;30;47m'
boldItalicBlue="\e[1;3;34m"
boldDimItalicBlue="\e[1;2;3;34m"
boldUnderscoreItalicBlue='\e[1;3;4;34m'

function testColor  {
    tabs 14
    value=$1          # le nom de la variable est passé en paramètre
    color=${!value}   # La valeur de la variable
    
    echo -en "\e[38;5;243m"
    echo -n $color # Attention: pas d'option '-e' car elle interprète le '\'
    echo -en "${endColor}\t- This is a ${color}${value}${endColor} text."
    echo -e "${endColor}"
}

tput clear # Echo the clear-screen sequence for the current terminal.
tput cup 3 10   # Send the sequence to move the cursor to row 3, column 0.
echo -e "\n\t\t------ \e[3m\e[7;34m \u2688 \u266b \u2669 \u266a \u266c \u266d \u266e \u266f \u2622 \u26e0 \u23fa  COLORS TEST  \x20\x04 \u23fa ${endColor} ------\n"
for i in {124..126} {160..165} {165..160} {126..124} ; do echo -en "\e[48;5;${i}m \e[0m" ; done
for i in {16..21} {21..16} ; do echo -en "\e[48;5;${i}m \e[0m" ; done ; echo
 
testColor black
testColor boldBlack

testColor lowRed
testColor red
testColor boldRed

testColor lowGreen
testColor green
testColor boldGreen

testColor lowYellow
testColor yellow
testColor boldYellow

testColor lowBlue
testColor blue
testColor boldBlue

testColor magenta
testColor boldMagenta

testColor cyan
testColor boldCyan

testColor lowWhite
testColor white
testColor boldwhite

testColor blueOnYellow
testColor boldBlueOnYellow

testColor blueOnWhite
testColor boldBlueOnWhite

testColor whiteOnBlack
testColor boldwhiteOnBlack

testColor blackOnWhite
testColor boldBlackOnWhite

testColor boldItalicBlue
testColor boldDimItalicBlue
testColor boldUnderscoreItalicBlue

tabs 5 # Set tab spaces
echo -e "\n${reverse}${boldItalic} --> 88/256 foreground colors: ${endColor}"
#for i in {1..256} ; do echo -en "\e[38;5;${i}m$i\t\e[0m" ; done ; echo
for color in {0..256} ; do #Colors
    #Display the color
    echo -en "\e[38;5;${color}m ${color}\t\e[0m"
    #Display 10 colors per lines
    if [ $((($color + 1) % 20)) == 0 ] ; then
        echo #New line
    fi
done

echo -e "\n\n${reverse}${boldItalic} --> 88/256 background colors: ${endColor}"
#for i in {1..256} ; do echo -en "\e[48;5;${i}m $i\e[0m" ; done ; echo -e "${endColor} "
for color in {0..256} ; do #Colors
    #Display the color
    echo -en "\e[48;5;${color}m ${color}\t\e[0m"
    #Display 10 colors per lines
    if [ $((($color + 1) % 20)) == 0 ] ; then
        echo #New line
    fi
done
echo #New line
echo #New line