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.\"
.IX Title "UUID 1"
.TH UUID 1 "OSSP uuid 1.6.2" "04-Jul-2008" "Universally Unique Identifier"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
uuid \- Universally Unique Identifier Command\-Line Tool
.SH "VERSION"
.IX Header "VERSION"
\&\s-1OSSP\s0 uuid \s-11.6.2 (04-Jul-2008)\s0
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBuuid\fR
[\fB\-v\fR \fIversion\fR]
[\fB\-m\fR]
[\fB\-n\fR \fIcount\fR]
[\fB\-1\fR]
[\fB\-F\fR \fIformat\fR]
[\fB\-o\fR \fIfilename\fR]
[\fInamespace\fR \fIname\fR]
.PP
\&\fBuuid\fR
\&\fB\-d\fR
[\fB\-r\fR]
[\fB\-o\fR \fIfilename\fR]
\&\fIuuid\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fB\s-1OSSP\s0 uuid\fR is a \s-1ISO\-C:1999\s0 application programming interface (\s-1API\s0) and
corresponding command line interface (\s-1CLI\s0) for the generation of \s-1DCE
1.1, ISO/IEC 11578:1996\s0 and \s-1IETF RFC\-4122\s0 compliant \fIUniversally Unique
Identifier\fR (\s-1UUID\s0). It supports \s-1DCE 1.1\s0 variant UUIDs of version 1 (time
and node based), version 3 (name based, \s-1MD5\s0), version 4 (random number
based) and version 5 (name based, \s-1SHA\-1\s0). Additional \s-1API\s0 bindings are
provided for the languages \s-1ISO\-\*(C+:1998,\s0 Perl:5 and \s-1PHP:4/5.\s0 Optional
backward compatibility exists for the ISO-C \s-1DCE\-1.1\s0 and Perl Data::UUID
APIs.
.PP
UUIDs are 128 bit numbers which are intended to have a high likelihood
of uniqueness over space and time and are computationally difficult
to guess. They are globally unique identifiers which can be locally
generated without contacting a global registration authority. UUIDs
are intended as unique identifiers for both mass tagging objects
with an extremely short lifetime and to reliably identifying very
persistent objects across a network.
.PP
This is the command line interface (\s-1CLI\s0) of \fB\s-1OSSP\s0 uuid\fR. For a
detailed description of UUIDs see the documentation of the application
programming interface (\s-1API\s0) in \fBuuid\fR\|(3).
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-v\fR \fIversion\fR" 3
.IX Item "-v version"
Sets the version of the generated \s-1DCE 1.1\s0 variant \s-1UUID.\s0 Supported
are \fIversion\fR "\f(CW1\fR\*(L", \*(R"\f(CW3\fR\*(L", \*(R"\f(CW4\fR\*(L" and \*(R"\f(CW5\fR\*(L". The default is \*(R"\f(CW1\fR".
.Sp
For version 3 and version 5 UUIDs the additional command line arguments
\&\fInamespace\fR and \fIname\fR have to be given. The \fInamespace\fR is either
a \s-1UUID\s0 in string representation or an identifier for internally
pre-defined namespace UUIDs (currently known are "\f(CW\*(C`ns:DNS\*(C'\fR\*(L",
\&\*(R"\f(CW\*(C`ns:URL\*(C'\fR\*(L", \*(R"\f(CW\*(C`ns:OID\*(C'\fR\*(L", and \*(R"\f(CW\*(C`ns:X500\*(C'\fR"). The \fIname\fR is a string of
arbitrary length.
.IP "\fB\-m\fR" 3
.IX Item "-m"
Forces the use of a random multi-cast \s-1MAC\s0 address when generating
version 1 UUIDs. By default the real physical \s-1MAC\s0 address of the system
is used.
.IP "\fB\-n\fR \fIcount\fR" 3
.IX Item "-n count"
Generate \fIcount\fR UUIDs instead of just a single one (the default).
.IP "\fB\-1\fR" 3
.IX Item "-1"
If option \fB\-n\fR is used with a \fIcount\fR greater than \f(CW1\fR, then this
option can enforce the reset the \s-1UUID\s0 context for each generated \s-1UUID.\s0
This makes no difference for \fIversion\fR \f(CW3\fR, \f(CW4\fR and \f(CW5\fR UUIDs. But
version \f(CW1\fR UUIDs are based on the previously generated \s-1UUID\s0 which is
remembered in the \s-1UUID\s0 context of the \s-1API.\s0 Option \fB\-1\fR deletes the
remembered \s-1UUID\s0 on each iteration.
.IP "\fB\-F\fR \fIformat\fR" 3
.IX Item "-F format"
Representation format for importing or exporting an \s-1UUID.\s0 The
following (case insensitive) format identifiers are currently recognized:
.RS 3
.ie n .IP "\*(C`BIN\*(C' (binary representation)" 4
.el .IP "\f(CW\*(C`BIN\*(C'\fR (binary representation)" 4
.IX Item "BIN (binary representation)"
This is the raw 128 bit network byte order binary representation of a
\&\s-1UUID.\s0 Example is the octet stream \f(CW\*(C`0xF8 0x1D 0x4F 0xAE 0x7D 0xEC 0x11
0xD0 0xA7 0x65 0x00 0xA0 0xC9 0x1E 0x6B 0xF6\*(C'\fR.
.ie n .IP "\*(C`STR\*(C' (string representation)" 4
.el .IP "\f(CW\*(C`STR\*(C'\fR (string representation)" 4
.IX Item "STR (string representation)"
This is the 36 character hexadecimal \s-1ASCII\s0 string representation of a
\&\s-1UUID.\s0 Example is the string "\f(CW\*(C`f81d4fae\-7dec\-11d0\-a765\-00a0c91e6bf6\*(C'\fR".
.ie n .IP "\*(C`SIV\*(C' (single integer value representation)" 4
.el .IP "\f(CW\*(C`SIV\*(C'\fR (single integer value representation)" 4
.IX Item "SIV (single integer value representation)"
This is the maximum 39 character long single integer
value representation of a \s-1UUID.\s0 Example is the string
"\f(CW329800735698586629295641978511506172918\fR".
.RE
.RS 3
.RE
.IP "\fB\-o\fR \fIfilename\fR" 3
.IX Item "-o filename"
Write output to \fIfilename\fR instead of to \fIstdout\fR.
.IP "\fB\-d\fR" 3
.IX Item "-d"
Decode a given \s-1UUID\s0 (given as a command line argument or if the command
line argument is "\f(CW\*(C`\-\*(C'\fR" the \s-1UUID\s0 is read from \fIstdin\fR) and dump textual
information about the \s-1UUID.\s0
.SH "EXAMPLES"
.IX Header "EXAMPLES"
.Vb 3
\& # generate DCE 1.1 v1 UUID (time and node based)
\& $ uuid \-v1
\& 01c47915\-4777\-11d8\-bc70\-0090272ff725
\&
\& # decode and dump DCE 1.1 v1 UUID (time and node based)
\& $ uuid \-d 01c47915\-4777\-11d8\-bc70\-0090272ff725
\& encode: STR:     01c47915\-4777\-11d8\-bc70\-0090272ff725
\&         SIV:     2349374037528578887923094374772111141
\& decode: variant: DCE 1.1, ISO/IEC 11578:1996
\&         version: 1 (time and node based)
\&         content: time:  2004\-01\-15 16:22:26.376322.1 UTC
\&                  clock: 15472 (usually random)
\&                  node:  00:90:27:2f:f7:25 (global unicast)
\&
\& # generate DCE 1.1 v3 UUID (name based)
\& $ uuid \-v3 ns:URL http://www.ossp.org/
\& 02d9e6d5\-9467\-382e\-8f9b\-9300a64ac3cd
\&
\& # decode and dump DCE 1.1 v3 UUID (name based)
\& $ uuid \-d 02d9e6d5\-9467\-382e\-8f9b\-9300a64ac3cd
\& encode: STR:     02d9e6d5\-9467\-382e\-8f9b\-9300a64ac3cd
\&         SIV:     3789866285607910888100818383505376205
\& decode: variant: DCE 1.1, ISO/IEC 11578:1996
\&         version: 3 (name based, MD5)
\&         content: 02:D9:E6:D5:94:67:08:2E:0F:9B:93:00:A6:4A:C3:CD
\&                  (not decipherable: MD5 message digest only)
\&
\& # generate DCE 1.1 v4 UUID 4 (random data based)
\& $ uuid \-v4
\& eb424026\-6f54\-4ef8\-a4d0\-bb658a1fc6cf
\&
\& # decode and dump DCE 1.1 v4 UUID 4 (random data based)
\& $ uuid \-d eb424026\-6f54\-4ef8\-a4d0\-bb658a1fc6cf
\& encode: STR:     eb424026\-6f54\-4ef8\-a4d0\-bb658a1fc6cf
\&         SIV:     312712571721458096795100956955942831823
\& decode: variant: DCE 1.1, ISO/IEC 11578:1996
\&         version: 4 (random data based)
\&         content: EB:42:40:26:6F:54:0E:F8:24:D0:BB:65:8A:1F:C6:CF
\&                  (no semantics: random data only)
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBuuid\fR\|(3), \fBOSSP::uuid\fR\|(3).