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
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.
The
uuidgen utility exits 0 on
success, and >0 if an error occurs.
uuidgen(2),
uuid(3)
The
uuidgen command first appeared in
NetBSD 3.0.