Cambiar color en terminal Bash
greenColour="\e[0;32m\033[1m"
redColour="\e[0;31m\033[1m"
blueColour="\e[0;34m\033[1m"
yellowColour="\e[0;33m\033[1m"
purpleColour="\e[0;35m\033[1m"
turquoiseColour="\e[0;36m\033[1m"
grayColour="\e[0;37m\033[1m"
endColour="\033[0m\e[0m"
echo -e "${purpleColour}hola${endColour}"
Link de referencia: https://misc.flogisoft.com/bash/tip_colors_and_formatting