#!/bin/bash
 
    # This program is free software. It comes without any warranty, to
    # the extent permitted by applicable law. You can redistribute it
    # and/or modify it under the terms of the Do What The Fuck You Want
    # To Public License, Version 2, as published by Sam Hocevar. See
    # http://sam.zoy.org/wtfpl/COPYING for more details.
 
    for fgbg in 38 48 ; do # Foreground / Background
        for color in {0..255} ; do # Colors
            # muestra el color
            printf "\e[${fgbg};5;%sm  %3s  \e[0m" $color $color
            # muestra 6 colores por línea
            if [ $((($color + 1) % 6)) == 4 ] ; then
                echo # nueva linea
            fi
        done
        echo # nueva linea
    done
 
    exit 0