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/bin/uuidgen/uuidgen.1

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 1.\" Copyright (c) 2002 Marcel Moolenaar
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25.\" $FreeBSD$
26.\"
27.Dd May 23, 2012
28.Dt UUIDGEN 1
29.Os
30.Sh NAME
31.Nm uuidgen
32.Nd generate universally unique identifiers
33.Sh SYNOPSIS
34.Nm
35.Op Fl 1
36.Op Fl n Ar count
37.Op Fl o Ar filename
38.Sh DESCRIPTION
39The
40.Nm
41utility by default generates a single DCE version 1
42universally unique identifier (UUID),
43also known as a globally unique identifier (GUID).
44The UUID is written to stdout by default.
45The following options can be used to change the behaviour of
46.Nm :
47.Bl -tag -width indent
48.It Fl 1
49This option only has effect if multiple identifiers are to be generated and
50instructs
51.Nm
52to not generate them in batch, but one at a time.
53.It Fl n
54This option controls the number of identifiers generated.
55By default, multiple identifiers are generated in batch.
56The upper hard limit is 2048
57.Po see
58.Xr uuidgen 2
59.Pc .
60.It Fl o
61Redirect output to
62.Ar filename
63instead of stdout.
64.El
65.Pp
66Batched generation yields a dense set of identifiers in such a way that there
67is no identifier that is larger than the smallest identifier in the set and
68smaller than the largest identifier in the set and that is not already in the
69set.
70.Pp
71When generating the identifiers one at a time, the identifiers will be close
72to each other, but operating system latency and processing time will be
73reflected in the distance between two successive identifiers.
74.Sh EXIT STATUS
75.Ex -std
76.Sh SEE ALSO
77.Xr uuidgen 2 ,
78.Xr uuid 3
79.Sh HISTORY
80The
81.Nm
82command first appeared in
83.Fx 5.0 .