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UUIDGEN(1) BSD General Commands Manual UUIDGEN(1)
uuidgen -- generate universally unique identifiers
uuidgen [-1s] [-n count] [-o filename]
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
Batched generation yields a dense set of identifiers in such a way that there is no identi-
fier 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.
The uuidgen utility exits 0 on success, and >0 if an error occurs.
The uuidgen command first appeared in NetBSD 3.0.
BSD September 13, 2004 BSD
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