1.\" $NetBSD: uuidgen.1,v 1.1 2004/09/13 23:35:19 thorpej Exp $ 2.\" 3.\" Copyright (c) 2002 Marcel Moolenaar 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.\" $FreeBSD: src/usr.bin/uuidgen/uuidgen.1,v 1.5 2003/05/22 13:10:32 ru Exp $ 28.\" 29.Dd September 13, 2004 30.Dt UUIDGEN 1 31.Os 32.Sh NAME 33.Nm uuidgen 34.Nd generate universally unique identifiers 35.Sh SYNOPSIS 36.Nm 37.Op Fl 1 38.Op Fl n Ar count 39.Op Fl o Ar filename 40.Op Fl s 41.Sh DESCRIPTION 42The 43.Nm 44utility by default generates a single universally unique identifier (UUID), 45also known as a globally unique identifier (GUID). 46By default, 47.Nm 48generates a single UUID and outputs it in the standard string representation 49to stdout. 50The following options can be used to change the behavior of 51.Nm : 52.Bl -tag -width indent 53.It Fl 1 54This option only has effect if multiple identifiers are to be generated and 55instructs 56.Nm 57to not generate them in batch, but one at a time. 58.It Fl n 59This option controls the number of identifiers generated. 60By default, multiple 61identifiers are generated in batch. 62.It Fl o 63Redirect output to 64.Ar filename 65instead of stdout. 66.It Fl c 67Output UUIDs as initialized C structures, rather than in the standard 68string format. 69.El 70.Pp 71Batched generation yields a dense set of identifiers in such a way that there 72is no identifier that is larger than the smallest identifier in the set and 73smaller than the largest identifier in the set and that is not already in the 74set. 75.Pp 76When generating the identifiers one at a time, the identifiers will be close 77to each other, but operating system latency and processing time will be 78reflected in the distance between two successive identifiers. 79.Sh DIAGNOSTICS 80.Ex -std 81.Sh SEE ALSO 82.Xr uuidgen 2 , 83.Xr uuid 3 84.Sh HISTORY 85The 86.Nm 87command first appeared in 88.Nx 3.0 . 89