is the serial number on the motherboard unique

[Shane Hathaway]

jessie at confettiantiques.com wrote:
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>> Merrill Oveson wrote:
>>> Then I thought all computers must have a motherboard - so why not use
>>> the
>>> serial number from it?
>>>
>>> Good idea, or is there something better?
> 
> Yes, that would work good. And the MAC address can easily be changed.
> Something like "ifconfig eth0 hw net 00:34:E3:F1:A0".
>> How about using:
>> dmidecode -s system-uuid

Keep in mind that some motherboards refuse to be reduced to a mere 
number. :-)  I have a Tyan board that gives this number:

$ sudo dmidecode -s system-uuid
00020003-0004-0005-0006-000700080009

Shane