1UUID(1) Universally Unique Identifier UUID(1)
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6 OSSP uuid - Universally Unique Identifier Command-Line Tool
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9 OSSP uuid 1.5.1 (31-Jul-2006)
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12 uuid [-v version] [-m] [-n count] [-1] [-F format] [-o filename]
13 [namespace name]
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15 uuid -d [-r] [-o filename] uuid
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18 OSSP uuid is a ISO-C:1999 application programming interface (API) and
19 corresponding command line interface (CLI) for the generation of DCE
20 1.1, ISO/IEC 11578:1996 and RFC 4122 compliant Universally Unique Iden‐
21 tifier (UUID). It supports DCE 1.1 variant UUIDs of version 1 (time and
22 node based), version 3 (name based, MD5), version 4 (random number
23 based) and version 5 (name based, SHA-1). Additional API bindings are
24 provided for the languages ISO-C++:1998, Perl:5 and PHP:4/5. Optional
25 backward compatibility exists for the ISO-C DCE-1.1 and Perl Data::UUID
26 APIs.
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28 UUIDs are 128 bit numbers which are intended to have a high likelihood
29 of uniqueness over space and time and are computationally difficult to
30 guess. They are globally unique identifiers which can be locally gener‐
31 ated without contacting a global registration authority. UUIDs are
32 intended as unique identifiers for both mass tagging objects with an
33 extremely short lifetime and to reliably identifying very persistent
34 objects across a network.
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36 This is the command line interface (CLI) of OSSP uuid. For a detailed
37 description of UUIDs see the documentation of the application program‐
38 ming interface (API) in uuid(3).
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41 -v version
42 Sets the version of the generated DCE 1.1 variant UUID. Supported
43 are version "1", "3", "4" and "5". The default is "1".
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45 For version 3 and version 5 UUIDs the additional command line argu‐
46 ments namespace and name have to be given. The namespace is either a
47 UUID in string representation or an identifier for internally pre-
48 defined namespace UUIDs (currently known are "ns:DNS", "ns:URL",
49 "ns:OID", and "ns:X500"). The name is a string of arbitrary length.
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51 -m Forces the use of a random multi-cast MAC address when generating
52 version 1 UUIDs. By default the real physical MAC address of the
53 system is used.
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55 -n count
56 Generate count UUIDs instead of just a single one (the default).
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58 -1 If option -n is used with a count greater than 1, then this option
59 can enforce the reset the UUID context for each generated UUID.
60 This makes no difference for version 3, 4 and 5 UUIDs. But version 1
61 UUIDs are based on the previously generated UUID which is remembered
62 in the UUID context of the API. Option -1 deletes the remembered
63 UUID on each iteration.
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65 -F format
66 Representation format for importing or exporting an UUID. The fol‐
67 lowing (case insensitive) format identifiers are currently recog‐
68 nized:
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70 BIN (binary representation)
71 This is the raw 128 bit network byte order binary representation
72 of a UUID. Example is the octet stream 0xF8 0x1D 0x4F 0xAE 0x7D
73 0xEC 0x11 0xD0 0xA7 0x65 0x00 0xA0 0xC9 0x1E 0x6B 0xF6.
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75 STR (string representation)
76 This is the 36 character hexadecimal ASCII string representation
77 of a UUID. Example is the string
78 "f81d4fae-7dec-11d0-a765-00a0c91e6bf6".
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80 SIV (single integer value representation)
81 This is the maximum 39 character long single integer value rep‐
82 resentation of a UUID. Example is the string
83 "329800735698586629295641978511506172918".
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85 -o filename
86 Write output to filename instead of to stdout.
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88 -d Decode a given UUID (given as a command line argument or if the com‐
89 mand line argument is "-" the UUID is read from stdin) and dump tex‐
90 tual information about the UUID.
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93 # generate DCE 1.1 v1 UUID (time and node based)
94 $ uuid -v1
95 01c47915-4777-11d8-bc70-0090272ff725
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97 # decode and dump DCE 1.1 v1 UUID (time and node based)
98 $ uuid -d 01c47915-4777-11d8-bc70-0090272ff725
99 encode: STR: 01c47915-4777-11d8-bc70-0090272ff725
100 SIV: 2349374037528578887923094374772111141
101 decode: variant: DCE 1.1, ISO/IEC 11578:1996
102 version: 1 (time and node based)
103 content: time: 2004-01-15 16:22:26.376322.1 UTC
104 clock: 15472 (usually random)
105 node: 00:90:27:2f:f7:25 (global unicast)
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107 # generate DCE 1.1 v3 UUID (name based)
108 $ uuid -v3 ns:URL http://www.ossp.org/
109 02d9e6d5-9467-382e-8f9b-9300a64ac3cd
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111 # decode and dump DCE 1.1 v3 UUID (name based)
112 $ uuid -d 02d9e6d5-9467-382e-8f9b-9300a64ac3cd
113 encode: STR: 02d9e6d5-9467-382e-8f9b-9300a64ac3cd
114 SIV: 3789866285607910888100818383505376205
115 decode: variant: DCE 1.1, ISO/IEC 11578:1996
116 version: 3 (name based, MD5)
117 content: 02:D9:E6:D5:94:67:08:2E:0F:9B:93:00:A6:4A:C3:CD
118 (not decipherable: MD5 message digest only)
119
120 # generate DCE 1.1 v4 UUID 4 (random data based)
121 $ uuid -v4
122 eb424026-6f54-4ef8-a4d0-bb658a1fc6cf
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124 # decode and dump DCE 1.1 v4 UUID 4 (random data based)
125 $ uuid -d eb424026-6f54-4ef8-a4d0-bb658a1fc6cf
126 encode: STR: eb424026-6f54-4ef8-a4d0-bb658a1fc6cf
127 SIV: 312712571721458096795100956955942831823
128 decode: variant: DCE 1.1, ISO/IEC 11578:1996
129 version: 4 (random data based)
130 content: EB:42:40:26:6F:54:0E:F8:24:D0:BB:65:8A:1F:C6:CF
131 (no semantics: random data only)
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134 uuid(3), OSSP::uuid(3).
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13831-Jul-2006 OSSP uuid 1.5.1 UUID(1)