Linux 2.6 - man page for uuidgen (linux section 1)
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uuidgen - command-line utility to create a new UUID value
The uuidgen program creates (and prints) a new universally unique identifier (UUID) using
the libuuid(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
There are two types of UUIDs which uuidgen can generate: time-based UUIDs and random-based
UUIDs. By default uuidgen will generate a random-based UUID if a high-quality random num-
ber 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 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.
OSF DCE 1.1
uuidgen was written by Andreas Dilger for libuuid.
The uuidgen command is part of the util-linux package and is available from ftp://ftp.ker-
Linux May 2009 UUIDGEN(1)
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