#!/bin/bash

echo "================old file:================"
cat /etc/hosts
echo "================hosts.txt================"
cat files/hosts.txt
echo ""
read -r -p "Do you want to append the host.txt? [y/N] " input
 
case $input in
      [yY][eE][sS]|[yY])
        echo "You say Yes"
	echo "================do job ...================"
	cat files/hosts.txt | sudo tee -a /etc/hosts

	echo "================new file:"================
	cat /etc/hosts
	 ;;
      [nN][oO]|[nN])
            echo "You say No"
            ;;
      *)
            echo "skip"
            exit 1
            ;;
esac