Mac 设置所有网络接口 DNS.sh

#! /bin/zsh

if [ $UID -ne 0 ]; then
    echo "Superuser privileges are required to run this script."
    echo "e.g. \"sudo $0\""
    exit 1
fi

OLD_IFS=$IFS

IFS=$'\n'

arr=(`networksetup -listallnetworkservices`)

len=${#arr[@]}

for ((i=2;i<$len;i++));do
    networksetup -setdnsservers "$arr[i]" 127.0.0.1
done

IFS=OLD_IFS

exit 0