uuidgen

UUIDGEN(1)                                                          UUIDGEN(1)



NAME
       uuidgen - command-line utility to create a new UUID value

SYNOPSIS
       uuidgen [-r|-t]

DESCRIPTION
       The uuidgen program creates (and prints) a new universally unique iden‐
       tifier (UUID) using the libuuid(3) library.  The new UUID  can  reason‐
       ably  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 two types of UUID's which uuidgen  can  generate:  time-based
       UUID's  and  random-based  UUID's.   By default uuidgen will generate a
       random-based UUID if a high-quality random number generator is present.
       Otherwise,  it  will  chose a time-based UUID.  It is possible to force
       the generation of one of these two UUID types by using  the  -r  or  -t
       options.

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

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

CONFORMING TO
       OSF DCE 1.1

AUTHOR
       uuidgen was written by Andreas Dilger for libuuid.

AVAILABILITY
       The uuidgen command is part of the util-linux-ng package and is  avail‐
       able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

SEE ALSO
       libuuid(3)



Linux                              May 2009                         UUIDGEN(1)