8:30 [macoontosh] /Users/shawn/Desktop%sudo ifconfig en0 ether 00:de:ad:be:ef:00 8:30 [macoontosh] /Users/shawn/Desktop%ifconfig en0 | grep ether ether 00:de:ad:be:ef:00 8:30 [macoontosh] /Users/shawn/Desktop%

Now if only I actually had a need for this (at the moment). ;)