Generate new MAC address for accessing time-limited hotspots

rotatemac.sh

#!/bin/bash
# Generate new MAC address for accessing time-limited hotspots like Boingo
# Modification may be needed; tested on Chrome OS
# No warranty / guarantees made. Use at your own risk. This probably violates some Terms of Service.

sudo ifconfig wlan0 down
# Source: http://superuser.com/questions/218340/how-to-generate-a-valid-random-mac-address-with-bash-shell
sudo ifconfig wlan0 hw ether $(echo -n 00:60:2F; dd bs=1 count=3 if=/dev/random 2>/dev/null | hexdump -v -e '/1 ":%02X"')
# OS X:
# sudo ifconfig en0 ether $(echo -n 00:60:2F; dd bs=1 count=3 if=/dev/random 2>/dev/null | hexdump -v -e '/1 ":%02X"')
sudo ifconfig wlan0 up

echo Open an incognito window to your favorite HTTP site.
echo Turn wifi off and on again if it does not work.