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CentOS 7.0 - man page for dbus-uuidgen (centos section 1)

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dbus-uuidgen(1) 								  dbus-uuidgen(1)

NAME
       dbus-uuidgen - Utility to generate UUIDs

SYNOPSIS
       dbus-uuidgen [--version] [--ensure[=FILENAME]] [--get[=FILENAME]]

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 "uuid-
       gen").

       See http://www.freedesktop.org/software/dbus/ for more information about D-Bus.

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

       This will ensure that /var/lib/dbus/machine-id exists and has the uuid in  it.	It  won't
       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 it with --get, it prints the machine UUID by default, or the UUID in the speci-
       fied 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. Don't try to change this file. Also, don't 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.

OPTIONS
       The following options are supported:

       --get[=FILENAME]
	      If  a  filename is not given, defaults to localstatedir/lib/dbus/machine-id (local-
	      statedir is usually /var). If this file exists and is valid, the uuid in	the  file
	      is printed on stdout. Otherwise, the command exits with a nonzero status.

       --ensure[=FILENAME]
	      If  a  filename is not given, defaults to localstatedir/lib/dbus/machine-id (local-
	      statedir is usually /var). 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.

       --version
	      Print the version of dbus-uuidgen

AUTHOR
       See http://www.freedesktop.org/software/dbus/doc/AUTHORS

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

										  dbus-uuidgen(1)
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