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It is wort to remember that the hardware serial number is stored in this pseudo file: <code>/proc/device-tree/som/uniqueid</code>.
===Q: How to get the network interfaces' MAC address?===
The network interfaces' MAC address is stored in this pseudo file: <code>/sys/class/net/<net_if>/address</code>
e.g.: for the primary ethernet interface <code>eth0</code> the MAC address is stored in the file <code>/sys/class/net/eth0/address</code>
