How to change the mac address in Linux

`# ifconfig eth0 down

ifconfig eth0 hw ether 00:80:48:BA:d1:20

ifconfig eth0 up

ifconfig eth0 |grep HWaddr`

This is always fun to do.  Why might you want to do this.  Say your friend paid for internet access at at coffee shop.  Your friend leaves early.  You change your mac to what his mac is and then you can freely surf the internet with out paying.  Kind of like using a parking meeter that still has time on it :>