Uuidgen

uuidgen generates a new GUID (globally unique ID), either based on time or by default on a local random number generator.

Options

 * -r --random (default) This generates a mostly-random UUID; requires a high quality random number generator such as /dev/random.
 * -t --time Generate a UUID based on time and ethernet address.
 * -h --help display help text and exit.
 * -V --version display version information and exit.

Provided by
Most (all?) Linux distributions incorporate this from the [util-linux] project