A bash snippet to request a Y/N confirmation from the user.

bash_confirm_yes_no.sh

#!/bin/bash

while true; do
    read -p "Do you really wish to do this thing? (y/n)? " yn
    case $yn in
        [Yy]* ) echo "Doing the thing now."; break;;
        [Nn]* ) exit;;
        * ) echo "Please answer yes or no.";;
    esac
done