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OpenSolaris 2009.06 - man page for dbus-uuidgen (opensolaris section 1)

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 com-
       patible with that spec.	Many systems have a  separate  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 running 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
       running.

       The UUID should be different on two different virtual machines, because there are two dif-
       ferent 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.freedesk-
       top.org/software/dbus/

SunOS 5.11				   19 Nov 2007				  dbus-uuidgen(1)


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