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 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 standard 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 1.38             June 2005                        UUIDGEN(1)

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