Script to print ANSI colors in the console

ansi_colors.sh

#!/bin/bash

readonly TEXT="xYz" # You may change this if you wish

readonly WIDTH=$((${#TEXT}+2))

FOREGROUND=(0 {30..37} {90..97})
BACKGROUND=('' {40..47} {100..107})
MODS=({0..8})
readonly FOREGROUND BACKGROUND MODS

print_line_bg() {
  local bg

  printf "%7s \033[%s  %${#TEXT}s  " "$1" "$1" "$TEXT"
  for bg in $BGs; do
    printf '\033[%s\033[%s %s \033[0m' "$1" "$bg" "$TEXT"
  done
  echo
}

print_bg() {
  local fg
  local BGs=''

  for bg in ${BACKGROUND[@]+"${BACKGROUND[@]}"}; do
    BGs="$(printf "%s%${WIDTH}s" "$BGs" "${bg:+${bg}m}")"
  done
  readonly BGs

  printf '\033[1mFOREGROUND/BACKGROUND\033[0m\n'
  echo "         $BGs"
  for fg in ${FOREGROUND[@]+"${FOREGROUND[@]}"}; do
    print_line_bg "${fg}m"
  done
  echo
}

print_mods() {
  local mod

  printf '\033[1mFONT MODIFIERS\033[0m\n'
  for mod in ${MODS[@]+"${MODS[@]}"}; do
    printf '%7s \033[%sm %s \033[0m\n' "${mod}m" "$mod" "$TEXT"
  done
  echo
}

print_mods
print_bg