Output text strings in all 8 base colors + their light/bold variant (tested in bash on OS X)

showcolors.sh

#!/bin/bash

i=30
for color in "black" "red" "green" "yellow" "blue" "purple" "cyan" "white" ; do
    for attr in 0 1; do
        if [[ $attr == 1 ]]; then
            prefix="bold/light "
        else
            prefix=""
        fi
        echo -en "\033[${attr};${i}mThis is ${prefix}${color} text\033[0m\n"
    done
    echo # newline
    ((i++))
done