Adding upstream version 2.36.1.upstream/2.36.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 102 insertions, 0 deletions

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+.\" Copyright 1999 Andreas Dilger (adilger@enel.ucalgary.ca)
+.\"
+.\" This file may be copied under the terms of the GNU Public License.
+.TH UUIDGEN 1 "June 2011" "util-linux" "User Commands"
+.SH NAME
+uuidgen \- create a new UUID value
+.SH SYNOPSIS
+.B uuidgen
+[options]
+.SH DESCRIPTION
+The
+.B uuidgen
+program creates (and prints)
+a new universally unique identifier (UUID) using the
+.BR libuuid (3)
+library.  The new UUID can reasonably be considered unique among
+all UUIDs created on the local system,
+and among UUIDs created on other systems in the past
+and in the future.
+.PP
+There are three types of UUIDs which
+.B uuidgen
+can generate: time-based UUIDs, random-based UUIDs, and hash-based UUIDs.
+By default
+.B uuidgen
+will generate a random-based UUID if a high-quality random number
+generator is present.  Otherwise, it will choose a time-based UUID.
+It is possible to force the generation of one of these first two
+UUID types by using the
+.B \-\-random
+or
+.B \-\-time
+options.
+.PP
+The third type of UUID is generated with the
+.B \-\-md5
+or
+.B \-\-sha1
+options, followed by
+\fB\-\-namespace\fR \fInamespace\fR
+and
+\fB\-\-name\fR \fIname\fR.
+The \fInamespace\fR may either be a well-known UUID, or else
+an alias to one of the well-known UUIDs defined in RFC 4122, that is
+.BR @dns ,
+.BR @url ,
+.BR @oid ,
+or
+.BR @x500 .
+The \fIname\fR is an arbitrary string value.  The generated UUID is the
+digest of the concatenation of the namespace UUID and the name value, hashed
+with the MD5 or SHA1 algorithms.  It is, therefore, a predictable value
+which may be useful when UUIDs are being used as handles or nonces for
+more complex values or values which shouldn't be disclosed directly.
+See the RFC for more information.
+.SH OPTIONS
+.TP
+.BR \-r , " \-\-random"
+Generate a random-based UUID.  This method creates a UUID consisting mostly
+of random bits.  It requires that the operating system have a high
+quality random number generator, such as
+.IR /dev/random .
+.TP
+.BR \-t , " \-\-time"
+Generate a time-based UUID.  This method creates a UUID based on the system
+clock plus the system's ethernet hardware address, if present.
+.TP
+.BR \-h , " \-\-help"
+Display help text and exit.
+.TP
+.BR \-V , " \-\-version"
+Display version information and exit.
+.TP
+.BR \-m , " \-\-md5"
+Use MD5 as the hash algorithm.
+.TP
+.BR \-s , " \-\-sha1"
+Use SHA1 as the hash algorithm.
+.TP
+.BR \-n , " \-\-namespace " \fInamespace\fP
+Generate the hash with the \fInamespace\fP prefix. The \fInamespace\fP is UUID,
+or '@ns' where "ns" is well-known predefined UUID addressed by namespace name
+(see above).
+.TP
+.BR \-N , " \-\-name " \fIname\fR
+Generate the hash of the \fIname\fR.
+.TP
+.BR \-x , " \-\-hex"
+Interpret name \fIname\fR as a hexadecimal string.
+.SH CONFORMING TO
+OSF DCE 1.1
+.SH EXAMPLES
+uuidgen \-\-sha1 \-\-namespace @dns \-\-name "www.example.com"
+.SH AUTHORS
+.B uuidgen
+was written by Andreas Dilger for libuuid.
+.SH SEE ALSO
+.BR libuuid (3),
+.B "RFC 4122"
+.SH AVAILABILITY
+The uuidgen command is part of the util-linux package and is available from
+https://www.kernel.org/pub/linux/utils/util-linux/.