freebsd-dev/bin/uuidgen/uuidgen.1
Marcel Moolenaar 4832865490 Add an -o filename option to have the output written to a file.
This option is present on most uuidgen(1) implementations even
though normal file redirection can be used to achieve the same.

Submitted by: Hiten Pandya <hiten@unixdaemons.com>
2003-03-15 02:27:10 +00:00

80 lines
2.7 KiB
Groff

.\" Copyright (c) 2002 Marcel Moolenaar
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.\" $FreeBSD$
.\"
.Dd May 23, 2002
.Dt UUIDGEN 1
.Os
.Sh NAME
.Nm uuidgen
.Nd generate universally unique identifiers
.Sh SYNOPSIS
.Nm
.Op Fl 1
.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).
The UUID is written to stdout by default.
The following options can be used to change the behaviour of
.Nm :
.Bl -tag -width indent
.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
This option controls the number of identifiers generated.
By default, multiple
identifiers are generated in batch.
.It Fl o
Redirect output to
.Ar filename
instead of stdout.
.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
.Fx 5.0 .