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uuidgen - command-line utility to create a new UUID value
uuidgen [ -r | -t ]
The uuidgen program creates a new universally unique identifier (UUID) using the libu-
uid(3) library. The new UUID can reasonably be considered unique among all UUIDs created
on the local system, and among UUIDs created on other systems in the past and in the
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 ran-
dom number generator is present. Otherwise, it will chose a time-based UUID. It is pos-
sible to force the generation of one of these two UUID types by using the -r or -t
-r Generate a random-based UUID. This method creates a UUID consisting mostly of ran-
dom 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.
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.
OSF DCE 1.1
uuidgen was written by Andreas Dilger for libuuid.
uuidgen is part of libuuid from the e2fsprogs package and is available from
E2fsprogs version 1.32 November 2002 UUIDGEN(1)
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