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 (and prints) a new universally unique iden‐
13       tifier (UUID) using the libuuid(3) library.  The new UUID  can  reason‐
14       ably  be considered unique among all UUIDs created on the local system,
15       and among UUIDs created on other systems in the past and in the future.
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17       There are two types of UUIDs which  uuidgen  can  generate:  time-based
18       UUIDs  and random-based UUIDs.  By default uuidgen will generate a ran‐
19       dom-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  -r  or  -t
22       options.
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OPTIONS

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

35       OSF DCE 1.1
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AUTHOR

38       uuidgen was written by Andreas Dilger for libuuid.
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AVAILABILITY

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