change-default-dns.sh

#!/bin/bash

# Prompt the user to choose a DNS server
echo "Choose a DNS server:"
echo "1. Cloudflare (1.1.1.1)"
echo "2. Google (8.8.8.8)"
read -p "Enter your choice (1 or 2): " choice

# Set the DNS server based on user's choice
case $choice in
1)
	DNS_SERVER="1.1.1.1"
	;;
2)
	DNS_SERVER="8.8.8.8"
	;;
*)
	echo "Invalid choice. Exiting."
	exit 1
	;;
esac

# Backup the current resolv.conf file
cp /etc/resolv.conf /etc/resolv.conf.bak

# Create a new resolv.conf file with the chosen DNS server
echo "nameserver $DNS_SERVER" | sudo tee /etc/resolv.conf >/dev/null

# Display a message indicating the change
echo "Default DNS changed to $DNS_SERVER"