Test script to understand bash script ANSII colour codes

color_script.sh

#!/usr/bin/env bash

txtund=$(tput sgr 0 1)          # Underline
txtbld=$(tput bold)             # Bold
bldred=${txtbld}$(tput setaf 9) #  red
bldblu=${txtbld}$(tput setaf 14) #  blue
bldwht=${txtbld}$(tput setaf 10) #  white
txtrst=$(tput sgr0)             # Reset
info=${bldwht}*${txtrst}        # Feedback
pass=${bldblu}*${txtrst}
warn=${bldred}*${txtrst}
ques=${bldblu}?${txtrst}

echo
echo -e "$(tput bold) reg  bld  und   tput-command-colors$(tput sgr0)"

for i in $(seq 1 7); do
  echo " $(tput setaf $i)Text$(tput sgr0) $(tput bold)$(tput setaf $i)Text$(tput sgr0) $(tput sgr 0 1)$(tput setaf $i)Text$(tput sgr0)  \$(tput setaf $i)"
done

echo ' Bold            $(tput bold)'
echo ' Underline       $(tput sgr 0 1)'
echo ' Reset           $(tput sgr0)'
echo

colors256() {
        local c i j

        printf "Colors 0 to 15 for the standard 16 colors\n"
        for ((c = 0; c < 16; c++)); do
                printf "|%s%3d%s" "$(tput setaf "$c")" "$c" "$(tput sgr0)"
        done
        printf "|\n\n"

        printf "Colors 16 to 231 for 256 colors\n"
        for ((i = j = 0; c < 232; c++, i++)); do
                printf "|"
                ((i > 5 && (i = 0, ++j))) && printf " |"
                ((j > 5 && (j = 0, 1)))   && printf "\b \n|"
                printf "%s%3d%s" "$(tput setaf "$c")" "$c" "$(tput sgr0)"
        done
        printf "|\n\n"

        printf "Greyscale 232 to 255 for 256 colors\n"
        for ((; c < 256; c++)); do
                printf "|%s%3d%s" "$(tput setaf "$c")" "$c" "$(tput sgr0)"
        done
        printf "|\n"
}

colors256