uuidgen - command-line utility to create a new UUID value
SYNOPSIS
uuidgen [ -r | -t ]
DESCRIPTION
The uuidgen program creates a new universally unique iden
tifier (UUID) using the libuuid(3) library. The new UUID
can reasonably be considered unique among all UUIDs cre
ated 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-qual
ity 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 consisting mostly of random bits. It
requires that the operating system have a high
quality random number generator, such as /dev/ran
dom.
-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 out
put 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)
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