Get your MAC address with the command AWK under Ubuntu
With this command line you can easily retrieve the address MAC of your NIC.
$ Ifconfig | awk '/ ^ eth0 / {print $ 5}'
A definition is needed on the term MAC address: this is a physical address of a network interface specified by the manufacturer which can uniquely identify a machine on a LAN.
The MAC address is a unique physical ID cards for all networks worldwide. It is registered permanently in ROM at the Factory.