spoof_wifi.sh

#!/bin/bash
IF=en0
MAC=`python << EOF
import random
print ":".join("%02X"%x for x in (random.randint(0, 255) for _ in range(6)))
EOF
`
echo "resetting wifi on $IF, rotating mac $MAC"
scselect -n
/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -z
ifconfig $IF link $MAC
networksetup -setairportnetwork $IF VirginTrainsEC-WiFi
echo "= MAC is now: ="
ifconfig $IF link