A Media Access Control address (MAC address) is a unique identifier assigned to a network interface controller (NIC). It is used to identify the device on a network and to control access to the network. On Linux, there are several ways to check the MAC address of a network interface.
One way to check the MAC address is to use the ifconfig command. This command will display information about all of the network interfaces on the system, including the MAC address. For example, the following command will display the MAC address of the eth0 interface: