tput cli menu dummy with 4 options

tput_menu.sh

#!/bin/bash

tput clear

main_menu()
{
until [ option = 4 ]; do
tput setb 2
tput setf 5
read -p """
1.) Monitor existing processes
2.) Copy /etc/passwd to /home directory
3.) Ping local host
4.) Exit
Enter choice: """ option
echo
case $option in

    1) ps aux;echo "The list has been successfully generated!";;
    2) cp /etc/passwd /home;echo "The passwd file has been copied to your home directory.";;
    3) ping -c 4 127.0.0.1;echo "You have completed pinging localhost" ;;
    4) exit;;
    *) tput setf 4; echo "Please enter between number 1 and 4\n\n";;

esac
done
}

main_menu