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UUIDGEN(1)                                User Commands                                UUIDGEN(1)

NAME
       uuidgen - create a new UUID value

SYNOPSIS
       uuidgen [options]

DESCRIPTION
       The  uuidgen program creates (and prints) a new universally unique identifier (UUID) using
       the libuuid(3) library.  The new UUID can reasonably be considered unique among all  UUIDs
       created  on  the local system, and among UUIDs created on other systems in the past and in
       the future.

       There are three types of UUIDs which uuidgen can generate: time-based UUIDs,  random-based
       UUIDs,  and  hash-based  UUIDs.  By default uuidgen will generate a random-based UUID if a
       high-quality random number generator is present.  Otherwise, it will choose  a  time-based
       UUID.   It is possible to force the generation of one of these first two UUID types by us-
       ing the --random or --time options.

       The third type of UUID is generated with the --md5 or --sha1 options, followed by  --name-
       space  namespace  and --name name.  The namespace may either be a well-known UUID, or else
       an alias to one of the well-known UUIDs defined in RFC 4122, that is @dns, @url, @oid,  or
       @x500.   The  name  is an arbitrary string value.  The generated UUID is the digest of the
       concatenation of the namespace UUID and the name value, hashed with the MD5 or SHA1  algo-
       rithms.   It  is,  therefore, a predictable value which may be useful when UUIDs are being
       used as handles or nonces for more complex values or values which shouldn't  be  disclosed
       directly.  See the RFC for more information.

OPTIONS
       -r, --random
              Generate a random-based UUID.  This method creates a UUID consisting mostly of ran-
              dom bits.  It requires that the operating system have a high quality random  number
              generator, such as /dev/random.

       -t, --time
              Generate  a  time-based UUID.  This method creates a UUID based on the system clock
              plus the system's ethernet hardware address, if present.

       -h, --help
              Display help text and exit.

       -V, --version
              Display version information and exit.

       -m, --md5
              Use MD5 as the hash algorithm.

       -s, --sha1
              Use SHA1 as the hash algorithm.

       -n, --namespace namespace
              Generate the hash with the namespace prefix. The namespace is UUID, or '@ns'  where
              "ns" is well-known predefined UUID addressed by namespace name (see above).

       -N, --name name
              Generate the hash of the name.

       -x, --hex
              Interpret name name as a hexadecimal string.

CONFORMING TO
       OSF DCE 1.1

EXAMPLES
       uuidgen --sha1 --namespace @dns --name "www.example.com"

AUTHOR
       uuidgen was written by Andreas Dilger for libuuid.

SEE ALSO
       libuuid(3), RFC 4122

AVAILABILITY
       The   uuidgen   command   is  part  of  the  util-linux  package  and  is  available  from
       https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux                                  June 2011                                  UUIDGEN(1)

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