uuidgen(1)

1UUIDGEN(1)                  General Commands Manual                 UUIDGEN(1)
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NAME

6       uuidgen - command-line utility to create a new UUID value
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SYNOPSIS

9       uuidgen [ -r | -t ]
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DESCRIPTION

12       The  uuidgen program creates a new universally unique identifier (UUID)
13       using the libuuid(3) library.  The new UUID can reasonably  be  consid‐
14       ered  unique  among  all  UUIDs  created on the local system, and among
15       UUIDs created on other systems in the past and in the future.
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17       There are two types of UUID's which uuidgen  can  generate:  time-based
18       UUID's  and  random-based  UUID's.   By default uuidgen will generate a
19       random-based UUID if a high-quality random number generator is present.
20       Otherwise,  it  will  chose a time-based UUID.  It is possible to force
21       the generation of one of these two UUID types by using the
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23       A UUID of the form 1b4e28ba-2fa1-11d2-883f-b9a761bde3fb  (in  printf(3)
24       format  "%08x-%04x-%04x-%04x-%012x")  is output to the standard output.
25       -r or -t options.
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OPTIONS

28       -r     Generate a random-based UUID.  This method creates a  UUID  con‐
29              sisting  mostly  of random bits.  It requires that the operating
30              system have a high quality  random  number  generator,  such  as
31              /dev/random.
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33       -t     Generate a time-based UUID.  This method creates a UUID based on
34              the system clock plus the system's ethernet hardware address, if
35              present.
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CONFORMING TO

38       OSF DCE 1.1
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AUTHOR

41       uuidgen was written by Andreas Dilger for libuuid.
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AVAILABILITY

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