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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | CONFORMING TO | AUTHOR | SEE ALSO | AVAILABILITY | COLOPHON |
UUIDGEN(1) User Commands UUIDGEN(1)
uuidgen - create a new UUID value
uuidgen [options]
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
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 -t options.
-r, --random
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.
-t, --time
Generate a time-based UUID. This method creates a UUID based
on the system clock plus the system's ethernet hardware
address, if present.
-h, --help
Display help text and exit.
-V, --version
Display version information and exit.
OSF DCE 1.1
uuidgen was written by Andreas Dilger for libuuid.
libuuid(3)
The uuidgen command is part of the util-linux package and is
available from https://www.kernel.org/pub/linux/utils/util-linux/.
This page is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2017-07-05. If you discover any rendering problems in this HTML ver‐
sion of the page, or you believe there is a better or more up-to-date
source for the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original man‐
ual page), send a mail to man-pages@man7.org
util-linux June 2011 UUIDGEN(1)
Pages that refer to this page: uuidparse(1), uuid_generate(3), swaplabel(8), uuidd(8)