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UUIDGEN

Section: User Commands (1)
Updated: May 2006
Index Return to Main Contents
 

NAME

uuidgen - command-line utility to create a new UUID value  

SYNOPSIS

uuidgen [ -r | -t ]  

DESCRIPTION

The uuidgen program creates 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 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.  

OPTIONS

-r
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
Generate a time-based UUID. This method creates a UUID based on the system clock plus the system's ethernet hardware address, if present.
 

RETURN VALUE

The UUID of the form 1b4e28ba-2fa1-11d2-883f-b9a761bde3fb (in printf(3) format "%08x-%04x-%04x-%04x-%012x") is output to the standard output.  

CONFORMING TO

OSF DCE 1.1  

AUTHOR

uuidgen was written by Andreas Dilger for libuuid.  

AVAILABILITY

uuidgen is part of libuuid from the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net.  

SEE ALSO

libuuid(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
RETURN VALUE
CONFORMING TO
AUTHOR
AVAILABILITY
SEE ALSO




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