dns-setter.sh

#!/bin/bash
# Please run this shell with "sudo ..."


SERVICE=Wi-Fi
# You could change the service. List all network services via:
# networksetup -listallnetworkservices

echo ""
echo "Current DNS on ${SERVICE}:"
networksetup -getdnsservers ${SERVICE}

echo "======================"
echo "0 . Default (Empty)"
echo "1 . google DNS"
echo "2 . ali DNS"
echo "3 . openDNS"
echo "4 . v2ex"
echo "5 . 114"
echo "Choose new DNS on ${SERVICE} :"
read newDNS

case $newDNS in
0)
    # default
    networksetup -setdnsservers ${SERVICE} Empty;;
1)
    # google DNS
    networksetup -setdnsservers ${SERVICE} 8.8.8.8 8.8.4.4;;
2)
    # ali DNS
    networksetup -setdnsservers ${SERVICE} 223.5.5.5 223.6.6.6;;
3)
    # openDNS
    networksetup -setdnsservers ${SERVICE} 208.67.222.222 208.67.220.220 208.67.222.220 208.67.220.222;;
4)
    # v2ex
    networksetup -setdnsservers ${SERVICE} 199.91.73.222 178.79.131.110;;
5)
    # 114
    networksetup -setdnsservers ${SERVICE} 114.114.114.114 114.114.115.115;;
*)
     echo " do nothing... ";;
esac

echo "======================"
echo "Current DNS on ${SERVICE}:"
networksetup -getdnsservers ${SERVICE}
echo ""
exit 0