dbus-uuidgen(1) 						   User Commands						   dbus-uuidgen(1)

NAME

       dbus-uuidgen - Utility to generate UUIDs

SYNOPSIS

       dbus-uuidgen [--ensure=file] [--get=file] [--version]

DESCRIPTION

       The dbus-uuidgen command generates or reads a universally unique ID.

       Note  that the D-Bus UUID has no relationship to RFC 4122 and does not generate UUIDs compatible with that spec.  Many systems have a sepa-
       rate command for that (often called "uuidgen").

       The primary usage of dbus-uuidgen is to run in the post-install script of a D-Bus package as shown in the example section of this document.

       This will ensure that /var/lib/dbus/machine-id exists and has the uuid in it.  It will not overwrite an existing uuid, since this id should
       remain fixed for a single machine until the next reboot at least.

       The important properties of the machine UUID are that 1) it remains unchanged until the next reboot and 2) it is different for any two run-
       ning instances of the OS kernel.  That is, if two processes see the same UUID, they should also see the same  shared  memory,  UNIX  domain
       sockets, local X displays, localhost.localdomain resolution, process IDs, and so forth.

       If you run dbus-uuidgen with no options it just prints a new uuid made up out of thin air.

       If you run dbus-uuidgen with --get, it prints the machine UUID by default, or the UUID in the specified file if you specify a file.

       If  you	try  to  change an existing machine-id on a running system, it will probably result in bad things happening.  Do not try to change
       this file.  Also, do not make it the same on two different systems; it needs to be different anytime there are two different  kernels  run-
       ning.

       The UUID should be different on two different virtual machines, because there are two different kernels.

       See http://www.freedesktop.org/software/dbus/ for more information.

OPTIONS

       The following options are supported:

       --ensure=file

	   If  a  file	is  not  given,  defaults  to /var/lib/dbus/machine-id.  If this file exists then it will be validated, and a failure code
	   returned if it contains the wrong thing.  If the file does not exist, it will be created with a new uuid in it.  On success, prints	no
	   output.

       --get=file

	   If  a  file	is  not given, defaults to /var/lib/dbus/machine-id.  If this file exists and is valid, the uuid in the file is printed on
	   stdout. Otherwise, the command exits with a nonzero status.

       --version

	   Print the version of dbus-uuidgen

EXAMPLES

       Example 1: The primary usage of dbus-uuidgen is to run in the post-install script of a D-Bus package

		 dbus-uuidgen --ensure

EXIT STATUS

       The following exit values are returned:

       0	Application exited successfully

       >0	Application exited with failure

FILES

       The following files are used by this application:

       /usr/bin/dbus-uuidgen	       Executable for dbus-uuidgen

       /var/lib/dbus/machine-id        File containing the uuid generated for this machine.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWdbus			   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Volatile			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       dbus-cleanup-sockets(1), dbus-daemon(1), dbus-launch(1), dbus-monitor(1), dbus-send(1), libdbus-glib-1(3), attributes(5)

NOTES

       For authorship information refer to http://www.freedesktop.org/software/dbus/doc/AUTHORS.  Updated by Brian Cameron, Sun Microsystems Inc.,
       2007.

       Please send bug reports to the D-Bus mailing list or bug tracker, see http://www.freedesktop.org/software/dbus/

SunOS 5.11							    19 Nov 2007 						   dbus-uuidgen(1)