#!/bin/bash
colors=($(xrdb -query | sed -n 's/.*color\([0-9]\)/\1/p' | sort -nu | cut -f2))

echo -e "\e[1;37m
 Red      Green    Yellow   Blue     Magenta   Cyan    White
 ─────────────────────────────────────────────────────────────\e[0m"
 for i in {1..7}; do echo -en "\e[$((30+$i))m ${colors[i]} \e[0m"; done
 echo
 for i in {9..15}; do echo -en "\e[1;$((22+$i))m ${colors[i]} \e[0m"; done
 echo -e "\n"