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Title "UUID 1" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
\fB\s-1OSSP\s0 uuid - Universally Unique Identifier Command-Line Tool Header "VERSION" \s-1OSSP\s0 uuid \s-11.6.2 (04-Jul-2008)\s0 Header "SYNOPSIS" \fBuuid [-v version] [-m] [-n count] [-1] [-F format] [-o filename] [namespace name]

\fBuuid \fB-d [-r] [-o filename] \fIuuid

Header "DESCRIPTION" \fB\s-1OSSP\s0 uuid 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\s0 1.1, \s-1ISO/IEC\s0 11578:1996 and \s-1IETF\s0 \s-1RFC-4122\s0 compliant Universally Unique Identifier (\s-1UUID\s0). It supports \s-1DCE\s0 1.1 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\s0.1 and Perl Data::UUID APIs.

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.

This is the command line interface (\s-1CLI\s0) of \s-1OSSP\s0 uuid. For a detailed description of UUIDs see the documentation of the application programming interface (\s-1API\s0) in uuid\|(3).

Header "OPTIONS" Item "-v version" Sets the version of the generated \s-1DCE\s0 1.1 variant \s-1UUID\s0. Supported are version "1\*(L", \*(R"3\*(L", \*(R"4\*(L" and \*(R"5\*(L". The default is \*(R"1". .Sp For version 3 and version 5 UUIDs the additional command line arguments \fInamespace and name have to be given. The namespace is either a \s-1UUID\s0 in string representation or an identifier for internally pre-defined namespace UUIDs (currently known are "\*(C`ns:DNS\*(C'\*(L", \*(R"\*(C`ns:URL\*(C'\*(L", \*(R"\*(C`ns:OID\*(C'\*(L", and \*(R"\*(C`ns:X500\*(C'"). The name is a string of arbitrary length. 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. Item "-n count" Generate count UUIDs instead of just a single one (the default). Item "-1" If option -n is used with a count greater than 1, then this option can enforce the reset the \s-1UUID\s0 context for each generated \s-1UUID\s0. This makes no difference for version 3, 4 and 5 UUIDs. But version 1 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 -1 deletes the remembered \s-1UUID\s0 on each iteration. Item "-F format" Representation format for importing or exporting an \s-1UUID\s0. The following (case insensitive) format identifiers are currently recognized: Item "-o filename" Write output to filename instead of to stdout. Item "-d" Decode a given \s-1UUID\s0 (given as a command line argument or if the command line argument is "\*(C`-\*(C'" the \s-1UUID\s0 is read from stdin) and dump textual information about the \s-1UUID\s0. 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 Header "SEE ALSO" \fIuuid\|(3), OSSP::uuid\|(3).