Display a matrice of Bash Colors in the terminal

bash_colors.sh

#!/bin/bash

T='gYw'
echo -e "\n                 40m     41m     42m     43m     44m     45m     46m     47m";
for FGs in '    m' '   1m' '  30m' '1;30m' '  31m' '1;31m' '  32m' '1;32m' '  33m' '1;33m' '  34m' '1;34m' '  35m' '1;35m' '  36m' '1;36m' '  37m' '1;37m';
do FG=${FGs// /}
echo -en " $FGs \033[$FG  $T  "
for BG in 40m 41m 42m 43m 44m 45m 46m 47m;
do echo -en "$EINS \033[$FG\033[$BG  $T \033[0m\033[$BG \033[0m";
done
echo;
done
echo