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84 lines
2.7 KiB
Groff
84 lines
2.7 KiB
Groff
.\" Copyright (c) 2002 Marcel Moolenaar
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 23, 2012
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.Dt UUIDGEN 1
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.Os
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.Sh NAME
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.Nm uuidgen
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.Nd generate universally unique identifiers
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.Sh SYNOPSIS
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.Nm
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.Op Fl 1
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.Op Fl n Ar count
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.Op Fl o Ar filename
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.Sh DESCRIPTION
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The
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.Nm
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utility by default generates a single DCE version 1
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universally unique identifier (UUID),
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also known as a globally unique identifier (GUID).
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The UUID is written to stdout by default.
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The following options can be used to change the behaviour of
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.Nm :
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.Bl -tag -width indent
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.It Fl 1
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This option only has effect if multiple identifiers are to be generated and
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instructs
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.Nm
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to not generate them in batch, but one at a time.
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.It Fl n
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This option controls the number of identifiers generated.
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By default, multiple identifiers are generated in batch.
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The upper hard limit is 2048
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.Po see
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.Xr uuidgen 2
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.Pc .
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.It Fl o
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Redirect output to
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.Ar filename
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instead of stdout.
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.El
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.Pp
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Batched generation yields a dense set of identifiers in such a way that there
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is no identifier that is larger than the smallest identifier in the set and
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smaller than the largest identifier in the set and that is not already in the
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set.
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.Pp
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When generating the identifiers one at a time, the identifiers will be close
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to each other, but operating system latency and processing time will be
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reflected in the distance between two successive identifiers.
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.Sh EXIT STATUS
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.Ex -std
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.Sh SEE ALSO
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.Xr uuidgen 2 ,
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.Xr uuid 3
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.Sh HISTORY
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The
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.Nm
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command first appeared in
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.Fx 5.0 .
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