termcolors

#!/usr/bin/bash
# terminal colors print
# info: http://www.pixelbeat.org/docs/terminal_colours/
# info: http://www.calmar.ws/vim/256-xterm-24bit-rgb-color-chart.html
# info: https://en.wikipedia.org/wiki/File:Xterm_256color_chart.svg

# ANSI 16
echo
for c in {0..7}; do
  printf "\e[37;0;48;5;${c}m  $c \e[0m"
done
echo -e "  ANSI 16"
for c in {8..9}; do
  printf "\e[37;0;48;5;${c}m  $c \e[0m"
done
for c in {10..15}; do
  printf "\e[37;0;48;5;${c}m $c \e[0m"
done
echo -e "\e[0m"

# Color-cube 216 (6x6x6)
echo
for c in {16..21}; do
  printf "\e[37;0;48;5;${c}m  $c \e[0m"
done
echo -e "    Color-cube 216 (6x6x6)"
for c in {22..99}; do
  printf "\e[37;0;48;5;${c}m  $c \e[0m"
  [ $((++j%6)) -eq 0 ] && echo -e "\e[0m"
done
for c in {100..231}; do
  printf "\e[37;0;48;5;${c}m $c \e[0m"
  [ $((++j%6)) -eq 0 ] && echo -e "\e[0m"
done

# Grayscale
echo
for c in {232..237}; do
  printf "\e[37;0;48;5;${c}m $c \e[0m"
done
echo -e "    Grayscale 24"
for c in {238..255}; do
  printf "\e[37;0;48;5;${c}m $c \e[0m"
  [ $((++j%6)) -eq 0 ] && echo -e "\e[0m"
done
echo