07-23-2014
It doesn't. It's a unique ID that's usually generated on install, but it can be duplicated. (For that matter, so can the Windows GUID!)
I don't think you can guarantee a unique ID in a virtualized environment, unless you generate a fresh ID every boot.
Last edited by Corona688; 07-23-2014 at 02:42 PM..
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LEARN ABOUT NETBSD
uuidgen
UUIDGEN(1) BSD General Commands Manual UUIDGEN(1)
NAME
uuidgen -- generate universally unique identifiers
SYNOPSIS
uuidgen [-1s] [-n count] [-o filename]
DESCRIPTION
The uuidgen utility by default generates a single universally unique identifier (UUID), also known as a globally unique identifier (GUID).
By default, uuidgen generates a single UUID and outputs it in the standard string representation to stdout. The following options can be
used to change the behavior of uuidgen:
-1 This option only has effect if multiple identifiers are to be generated and instructs uuidgen to not generate them in
batch, but one at a time.
-n count This option controls the number of identifiers generated. By default, multiple identifiers are generated in batch.
-o filename Redirect output to filename instead of stdout.
-s Output UUIDs as initialized C structures, rather than in the standard string format.
Batched generation yields a dense set of identifiers in such a way that there is no identifier that is larger than the smallest identifier in
the set and smaller than the largest identifier in the set and that is not already in the set.
When generating the identifiers one at a time, the identifiers will be close to each other, but operating system latency and processing time
will be reflected in the distance between two successive identifiers.
DIAGNOSTICS
The uuidgen utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
uuidgen(2), uuid(3)
HISTORY
The uuidgen command first appeared in NetBSD 3.0.
BSD
September 13, 2004 BSD