prints a color table of 8bg * 8fg * 2 states (regular/bold)

#!/bin/bash

# prints a color table of 8bg * 8fg * 2 states (regular/bold)
echo
echo Table for 16-color terminal escape sequences.
echo Replace ESC with \\033 in bash.
echo
echo "Background | Foreground colors"
echo "---------------------------------------------------------------------"
for((bg=40;bg<=47;bg++)); do
 for((bold=0;bold<=1;bold++)) do
  echo -en "\033[0m"" ESC[${bg}m   | "
  for((fg=30;fg<=37;fg++)); do
   if [ $bold == "0" ]; then
    echo -en "\033[${bg}m\033[${fg}m [${fg}m  "
   else
    echo -en "\033[${bg}m\033[1;${fg}m [1;${fg}m"
   fi
  done
  echo -e "\033[0m"
 done
 echo "--------------------------------------------------------------------- "
done

echo
echo

colortable16.sh
shell> ruby -e 'print "\e[33m"'
shell> ruby -e 'print "\e[0m"'
shell> ruby -e 'print "\e[1m"'
shell> printf "\e[0m"
shell> echo -e "\e[1m"
shell> echo -e "\033[47m\033[1;31mBright red on white.\033[0m"