UUIDGEN linux command manual
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 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.
-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
-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 stan-
OSF DCE 1.1
uuidgen was written by Andreas Dilger for libuuid.
uuidgen is part of libuuid from the e2fsprogs package and is available
E2fsprogs version 1.35 February 2004 UUIDGEN(1)