wneessen

INTERFACES=`echo "list State:/Network/Service/[^/]+/DNS" | scutil | awk -F= '{print $2}'`
SERVER=<yourDNS>
for INTERFACE in ${INTERFACES}
do
   echo "get ${INTERFACE}\nd.add ServerAddresses * ${SERVER}\nset ${INTERFACE}" | sudo scutil
done

jrk

# The MIT License
# 
# Copyright (c) 2008 Jared Kuolt
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions: