10-24-2001
Don't forget security... There's nothing worse than being cracked into because you didn't know what was running on your machine.
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9. What is on Your Mind?
Retro Games has announced that the C64 is back, this time full-sized with a working keyboard for the dedicated retro home-computer fan, available December 2019.
See also:
CNN:
Iconic 80s computer The Commodore 64 to return with fully-functional keyboard
YouTube:
The C64 | Trailer
... (2 Replies)
Discussion started by: Neo
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LEARN ABOUT ULTRIX
dbus-uuidgen
DBUS-UUIDGEN(1) User Commands 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 compatible with that spec. Many systems have a
separate command for that (often called "uuidgen").
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 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. 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 different kernels.
OPTIONS
The following options are supported:
--get[=FILENAME]
If a filename is not given, defaults to localstatedir/lib/dbus/machine-id (localstatedir 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 (localstatedir 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.freedesktop.org/software/dbus/
D-Bus 1.12.2 DBUS-UUIDGEN(1)