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\" $FreeBSD: src/usr.bin/uuidgen/uuidgen.1,v 1.5 2003/05/22 13:10:32 ru Exp $
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Dd September 13, 2004
Dt UUIDGEN 1
Os
Sh NAME
Nm uuidgen
Nd generate universally unique identifiers
Sh SYNOPSIS
Nm
Op Fl 1s
Op Fl n Ar count
Op Fl o Ar filename
Sh DESCRIPTION
The
Nm
utility by default generates a single universally unique identifier (UUID),
also known as a globally unique identifier (GUID).
By default,
Nm
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
Nm :
Bl -tag -offset indent -width XoXfilenameXX
It Fl 1
This option only has effect if multiple identifiers are to be generated and
instructs
Nm
to not generate them in batch, but one at a time.
It Fl n Ar count
This option controls the number of identifiers generated.
By default, multiple identifiers are generated in batch.
It Fl o Ar filename
Redirect output to
Ar filename
instead of stdout.
It Fl s
Output UUIDs as initialized C structures, rather than in the standard
string format.
El
Pp
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.
Pp
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.
Sh DIAGNOSTICS
Ex -std
Sh SEE ALSO
Xr uuidgen 2 ,
Xr uuid 3
Sh HISTORY
The
Nm
command first appeared in
Nx 3.0 .

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