#!/usr/bin/env bash
# Show all the colors of the rainbow, should be run under bash
for STYLE in $(seq 0 9; echo 21 53); do
  for FG in $(seq 30 39; seq 90 97); do
    for BG in $(seq 40 49; seq 100 107); do
      CTRL="${STYLE};${FG};${BG}"
      echo -en "\e[${CTRL}m${CTRL}\e[m "
    done
    echo
  done
  echo
done
# Reset
echo -e "\e[m"