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

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