09-05-2016
Before attempting ANYTHING that hits the hardware hard, read up on any protocols required for the USB ports, plus how they work and this includes the keyboard and mouse for those ports too. KB and mouse use USB version 1.1, [1.0?], minimum and do not require I/O speeds greater than about 1.5Mbs data rate.
In Linux flavours, or at least most, there are __accessable__ devices that can be read from and/or written to. I have no idea if this is true of professional UNIX tools however. The protocol for the keyboards being sent and received can be read easily using basic code in differing languages but not necessarily sync'd at all. The data being sent by the KB has many bytes in it in binary form; the same goes for the pointing device,(mouse).
Writing to a USB port via one of these devices is not the same animal however.
Unless you have at least studied how this/these __serial__ interfaces work be careful as they are __effectively__ in __parallel__. As bakunin has implied these could be allocated tty[?] device names in the UNIX domain but can be COM[?], usually COM1 and COM2 for KB and mouse respectively, in the Windows domain, but I have no idea what they are in the Apple OSX !0.7.x and above domain, perhaps also tty[?]. The Linux domains could be special devices and/or tty[?].
IMO it is certainly not an easy task for a novice to intercept a second KB's I/O and redirect from its main duty as user input on any machine in question.
(I would like to be proven wrong however.)
Bazza.
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LEARN ABOUT DEBIAN
setupcon
SETUPCON(1) Console-setup User's Manual SETUPCON(1)
NAME
setupcon - sets up the font and the keyboard on the console
SYNOPSIS
setupcon [OPTION]... [VARIANT]
DESCRIPTION
setupcon is a program for fast and easy setup of the font and the keyboard on the console. Most of the time you invoke setupcon without
arguments. The keyboard configuration is specified in ~/.keyboard or /etc/default/keyboard. The font configuration is specified in
~/.console-setup or /etc/default/console-setup. Consult keyboard(5) and console-setup(5) for instructions how to configure these two
files.
If you have to switch often between different encodings, keyboards or languages, you can prepare several alternative configuration files
for setupcon. Suppose that most of the time you will use Greek language with Greek keyboard layout, but sometimes you need to type in Ger-
man with German keyboard layout. In this situation you should customize the main configuration files (keyboard and console-setup) for
Greek. Create also alternative configuration files for German named keyboard.german and console-setup.german. Then in order to configure
the console for Greek you will simply run the command with no arguments: setupcon and in order to configure the console for German you will
use setupcon german.
OPTIONS
-v, --verbose
Be more verbose. Use this option if something goes wrong or while experimenting with the configuration files.
-k, --keyboard-only
Setup the keyboard only, do not setup the font.
-f, --font-only
Setup the font only, do not setup the keyboard.
--force
Do not check whether we are on the console. Notice that you can be forced to hard-reboot your computer if you run setupcon with
this option and the screen is controlled by a X server.
--save This option can be useful if you want to use setupcon early in the boot process while /usr is not yet mounted and the required data
are not available. This option will make setupcon copy the required files in /etc/console-setup/ in order to make them available
before /usr is mounted. If you use setupcon early in the boot process, then you should run it with this option after every change
of the console configuration.
--save-only
The same as --save, but does not setup the keyboard and the font. This option can be useful if you want to save the required files
while the screen is controlled by a X server.
-h, --help
Display usage information.
VARIANT
Specifies which configuration file to use. By default the configuration files of setupcon are named console-setup and keyboard but
if you use e.g. chukchi as VARIANT then the configuration files will be console-setup.chukchi and keyboard.chukchi. In this way
you can have easy access to several different configurations - for example one for the Chukchi language and another for the default
configuration.
FILES
~/.console-setup
~/.keyboard
/etc/default/console-setup
/etc/default/keyboard
/etc/default/console-setup.VARIANT
/etc/default/keyboard.VARIANT
/etc/console-setup/
SEE ALSO
keyboard(5), console-setup(5)
console-setup 2011-03-17 SETUPCON(1)