SHELL

red bash linux

Black        0;30     Dark Gray     1;30
Red          0;31     Light Red     1;31
Green        0;32     Light Green   1;32
Brown/Orange 0;33     Yellow        1;33
Blue         0;34     Light Blue    1;34
Purple       0;35     Light Purple  1;35
Cyan         0;36     Light Cyan    1;36
Light Gray   0;37     White         1;37
And then use them like this in your script:

RED='33[0;31m'
NC='33[0m' # No Color
printf "I ${RED}love${NC} Stack Overflow
"