local fgc bgc vals seq0

printf "Color escapes are %s\n" '\e[${value};...;${value}m'
printf "Values 30..37 are \e[33mforeground colors\e[m\n"
printf "Values 40..47 are \e[43mbackground colors\e[m\n"
printf "Value  1 gives a  \e[1mbold-faced look\e[m\n\n"

# foreground colors
for fgc in {30..37}; do
	# background colors
	for bgc in {40..47}; do
		fgc=${fgc#37} # white
		bgc=${bgc#40} # black

		vals="${fgc:+$fgc;}${bgc}"
		vals=${vals%%;}

		seq0="${vals:+\e[${vals}m}"
		printf "  %-9s" "${seq0:-(default)}"
		printf " ${seq0}TEXT\e[m"
		printf " \e[${vals:+${vals+$vals;}}1mBOLD\e[m"
	done
	echo; echo
done