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67 lines
1.9 KiB
Groff
67 lines
1.9 KiB
Groff
.\" Copyright 1999 Andreas Dilger (adilger@enel.ucalgary.ca)
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.\"
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.\" This man page was created for libuuid.so.1.1 from e2fsprogs-1.14.
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.\"
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.\" This file may be copied under the terms of the GNU Public License.
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.\"
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.\" Created Wed Mar 10 17:42:12 1999, Andreas Dilger
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.TH UUIDGEN 1 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
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.SH NAME
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uuidgen \- command\-line utility to create a new UUID value
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.SH SYNOPSIS
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.B uuidgen
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[
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.B \-r
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.B \-t
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]
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.SH DESCRIPTION
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The
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.B uuidgen
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program creates a new universally unique identifier (UUID) using the
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.BR libuuid (3)
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library. The new UUID can reasonably be considered unique among
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all UUIDs created on the local system,
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and among UUIDs created on other systems in the past
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and in the future.
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.PP
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There are two types of UUID's which
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.B uuidgen
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can generate: time-based UUID's and random-based UUID's. By
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default
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.B uuidgen
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will generate a random-based UUID if a high-quality random number
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generator is present. Otherwise, it will chose a time-based UUID. It
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is possible to force the generation of one of these two
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UUID types by using the
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.B \-r
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or
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.B \-t
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options.
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.SH OPTIONS
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.TP
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.B \-r
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Generate a random-based UUID. This method creates a UUID consisting mostly
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of random bits. It requires that the operating system have a high
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quality random number generator, such as
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.IR /dev/random .
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.TP
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.B \-t
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Generate a time-based UUID. This method creates a UUID based on the system
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clock plus the system's ethernet hardware address, if present.
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.SH RETURN VALUE
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The UUID of the form 1b4e28ba-2fa1-11d2-883f-b9a761bde3fb (in
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.BR printf (3)
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format "%08x-%04x-%04x-%04x-%012x") is output to the standard output.
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.SH "CONFORMING TO"
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OSF DCE 1.1
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.SH AUTHOR
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.B uuidgen
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was written by Andreas Dilger for libuuid.
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.SH AVAILABILITY
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.B uuidgen
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is part of libuuid from the e2fsprogs package and is available from
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http://e2fsprogs.sourceforge.net.
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.SH "SEE ALSO"
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.BR libuuid (3)
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