{ pkgs }:

pkgs.writeShellScriptBin "colors" ''
  space="    "

  output=""

  for l in $(printf "40\n100"); do

    for i in $(seq $l $((l + 9))); do
      output="$output\033[0;''${i}m$space"
    done

    output="$output\033[0m\n"
  done

  printf "$output"
''