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If Ethernet is the only connection to your computer at the time you run getmac, then the physical address whose Transport Name isn't media disconnected is the MAC address you are looking for.
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If your Linux OS does not have the ifconfig command, you may also use the ip addr command.The MAC address will be listed next to HWaddr. Open a terminal and use the ifconfig command.
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Instructions to properly identify the MAC address for each corresponding Operating System is listed below: Letters must also be capitalized on the form. Please always include the colons ( :'s) between the numbers. On Windows it will sometimes be represented with dashes between the numbers. The physical (MAC) address is an 8 byte number such as 08:00:20:9A:38:34. For that reason, the MAC address of a machine is required so that it can be properly configured for the engineering network. The MAC address is used to assign the TCP/IP address by means of DHCP (Dynamic Host Configuration Protcol). This is the actual hardware address that the lowest level of the network uses to communicate. Every network interface has a MAC address (Media Access Controller) also known as the physical address.
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