create a new UUID value
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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 the future.
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 number
generator is present. Otherwise, it will choose a time-based
UUID. It is possible to force the generation of one of these
two UUID types by using the -r or
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/random.
Generate a time-based UUID.
This method creates a UUID based on the system clock plus
the system’s ethernet hardware address, if
Display help text and exit.
Display version information and
The uuidgen command is part of the util-linux package and is
available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
OSF DCE 1.1
was written by Andreas Dilger for libuuid.