This is colour output snippet for shell script.

bash_script_color.sh

#!/bin/bash

# Reset
Color_Off=''

# Regular Colors
Red=''
Green=''
Yellow=''
Cyan=''
Magenta=''
Dim='' # White

# Bold
Bold_White=''
Bold_Green=''

if [[ -t 1 ]]; then
    # Reset
    Color_Off='\033[0m' # Text Reset

    # Regular Colors
    Red='\033[0;31m'   # Red
    Green='\033[0;32m' # Green
    Yellow='\033[1;33m' # Yellow
    Cyan='\033[0;36m'
    Magenta='\033[1;35m'
    Dim='\033[0;2m'    # White

    # Bold
    Bold_Green='\033[1;32m' # Bold Green
    Bold_White='\033[1m'    # Bold White
fi

error() {
    echo -e "${Red}error${Color_Off}:" "$@" >&2
    exit 1
}

info() {
    echo -e "${Dim}$@ ${Color_Off}"
}

info_bold() {
    echo -e "${Bold_White}$@ ${Color_Off}"
}

success() {
    echo -e "${Green}$@ ${Color_Off}"
}

bold_success() {
    echo -e "${Bold_Green}$@ ${Color_Off}"
}

intro() {
    echo -e "${Yellow}$@ ${Color_Off}"
}

more example

# Reset
Color_Off=''

# Regular Colors
Red=''
Green=''
Yellow=''
Dim='' # White

if [[ -t 1 ]]; then
    # Reset
    Color_Off='\033[0m' # Text Reset

    # Regular Colors
    Red='\033[1;31m'   # Red
    Green='\033[1;32m' # Green
    Yellow='\033[1;33m' # Yellow
    Dim='\033[1;2m'    # White
fi


status() { echo -e "${Dim}INFO   ${Color_Off}: $*" >&2; }
success() { echo -e "${Green}SUCCESS${Color_Off}: $*"; }
error() { echo -e "${Red}ERROR${Color_Off}  : $*"; exit 1; }
warning() { echo -e "${Yellow}WARNING${Color_Off}: $*"; }

status 'Ths is status' 
success 'MeltCD installed'
warning 'This is warning'
error 'This is error'