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CentOS 7.0 - man page for uuid (centos section 1)

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UUID(1) 			  Universally Unique Identifier 			  UUID(1)

       uuid - OSSP Universally Unique Identifier Command-Line Tool

       OSSP uuid 1.6.2 (04-Jul-2008)

       uuid [-v version] [-m] [-n count] [-1] [-F format] [-o filename] [namespace name]

       uuid -d [-r] [-o filename] uuid

       OSSP uuid is a ISO-C:1999 application programming interface (API) and corresponding
       command line interface (CLI) for the generation of DCE 1.1, ISO/IEC 11578:1996 and IETF
       RFC-4122 compliant Universally Unique Identifier (UUID). It supports DCE 1.1 variant UUIDs
       of version 1 (time and node based), version 3 (name based, MD5), version 4 (random number
       based) and version 5 (name based, SHA-1). Additional API bindings are provided for the
       languages ISO-C++:1998, Perl:5 and PHP:4/5. Optional backward compatibility exists for the
       ISO-C DCE-1.1 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

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

       -v version
	  Sets the version of the generated DCE 1.1 variant UUID. Supported are version "1", "3",
	  "4" and "5". The default is "1".

	  For version 3 and version 5 UUIDs the additional command line arguments namespace and
	  name have to be given. The namespace is either a UUID in string representation or an
	  identifier for internally pre-defined namespace UUIDs (currently known are "ns:DNS",
	  "ns:URL", "ns:OID", and "ns:X500"). The name is a string of arbitrary length.

       -m Forces the use of a random multi-cast MAC address when generating version 1 UUIDs. By
	  default the real physical MAC address of the system is used.

       -n count
	  Generate count UUIDs instead of just a single one (the default).

       -1 If option -n is used with a count greater than 1, then this option can enforce the
	  reset the UUID context for each generated UUID.  This makes no difference for version
	  3, 4 and 5 UUIDs. But version 1 UUIDs are based on the previously generated UUID which
	  is remembered in the UUID context of the API. Option -1 deletes the remembered UUID on
	  each iteration.

       -F format
	  Representation format for importing or exporting an UUID. The following (case
	  insensitive) format identifiers are currently recognized:

	  BIN (binary representation)
	      This is the raw 128 bit network byte order binary representation of a UUID. Example
	      is the octet stream 0xF8 0x1D 0x4F 0xAE 0x7D 0xEC 0x11 0xD0 0xA7 0x65 0x00 0xA0
	      0xC9 0x1E 0x6B 0xF6.

	  STR (string representation)
	      This is the 36 character hexadecimal ASCII string representation of a UUID. Example
	      is the string "f81d4fae-7dec-11d0-a765-00a0c91e6bf6".

	  SIV (single integer value representation)
	      This is the maximum 39 character long single integer value representation of a
	      UUID. Example is the string "329800735698586629295641978511506172918".

       -o filename
	  Write output to filename instead of to stdout.

       -d Decode a given UUID (given as a command line argument or if the command line argument
	  is "-" the UUID is read from stdin) and dump textual information about the UUID.

	# generate DCE 1.1 v1 UUID (time and node based)
	$ uuid -v1

	# 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/

	# 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

	# 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)

       uuid(3), OSSP::uuid(3).

04-Jul-2008				 OSSP uuid 1.6.2				  UUID(1)
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