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uuidgen(1) [netbsd man page]

UUIDGEN(1)						    BSD General Commands Manual 						UUIDGEN(1)

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

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UUIDGEN(1)						      General Commands Manual							UUIDGEN(1)

uuidgen - command-line utility to create a new UUID value SYNOPSIS
uuidgen [-r|-t] DESCRIPTION
The uuidgen program creates (and prints) a new universally unique identifier (UUID) using the libuuid(3) library. The new UUID can reason- ably be considered unique among all UUIDs created on the local system, and among UUIDs created on other systems in the past and in the future. There are two types of UUIDs which uuidgen can generate: time-based UUIDs and random-based UUIDs. By default uuidgen will generate a ran- dom-based UUID if a high-quality random number generator is present. Otherwise, it will chose a time-based UUID. It is possible to force the generation of one of these two UUID types by using the -r or -t options. OPTIONS
-r Generate a random-based UUID. This method creates a UUID consisting mostly of random bits. It requires that the operating system have a high quality random number generator, such as /dev/random. -t Generate a time-based UUID. This method creates a UUID based on the system clock plus the system's ethernet hardware address, if present. CONFORMING TO
uuidgen was written by Andreas Dilger for libuuid. AVAILABILITY
The uuidgen command is part of the util-linux package and is available from SEE ALSO
libuuid(3) Linux May 2009 UUIDGEN(1)
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