UUIDGEN linux command manual

UUIDGEN(1)                                                         UUIDGEN(1)



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

SYNOPSIS
       uuidgen [ -r | -t ]

DESCRIPTION
       The uuidgen program creates a new universally unique identifier (UUID)
       using the libuuid(3) library.  The new UUID can reasonably be  consid-
       ered  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.

RETURN VALUE
       The  UUID  of  the   form   1b4e28ba-2fa1-11d2-883f-b9a761bde3fb   (in
       printf(3)  format  "%08x-%04x-%04x-%04x-%012x") is output to the stan-
       dard output.

CONFORMING TO
       OSF DCE 1.1

AUTHOR
       uuidgen was written by Andreas Dilger for libuuid.

AVAILABILITY
       uuidgen is part of libuuid from the e2fsprogs package and is available
       from http://e2fsprogs.sourceforge.net.

SEE ALSO
       libuuid(3)



E2fsprogs version 1.35          February 2004                      UUIDGEN(1)