KBDCONTROL(1) BSD General Commands Manual KBDCONTROL(1)
kbdcontrol -- keyboard control and configuration utility
kbdcontrol [-dFKix] [-A name] [-a name] [-b duration.pitch | belltype] [-r delay.repeat | speed] [-l keymap_file] [-f # string]
[-k keyboard_device] [-L keymap_file]
The kbdcontrol command is used to set various keyboard related options for the syscons(4) or vt(4) console driver and the keyboard drivers,
such as key map, keyboard repeat and delay rates, bell characteristics etc.
Keyboard options may be automatically configured at system boot time by setting variables in /etc/rc.conf. See Boot Time Configuration
The following command line options are supported:
Detach the keyboard, specified by the keyboard device name, from the keyboard multiplexer. When using this option, the standard
input of the kbdcontrol process should be redirected from the keyboard multiplexer keyboard device (if the keyboard multiplexer is
not the active keyboard) or /dev/console (if the keyboard multiplexer is the active keyboard and you are not working on the system
Attach the keyboard, specified by the keyboard device name, to the keyboard multiplexer. When using this option, the standard input
of the kbdcontrol process should be redirected from the keyboard multiplexer keyboard device (if the keyboard multiplexer is not the
active keyboard) or /dev/console (if the keyboard multiplexer is the active keyboard and you are not working on the system console).
-b duration.pitch | belltype
Set the bell duration in milliseconds and pitch in hertz. If a belltype argument is specified, it may be one of normal which sets
sound parameters back to normal values, off which disables the bell entirely, or visual which sets the bell to visual mode, i.e.,
flashes the screen instead. If belltype is preceded by the word quiet., the bell will not be rung when the ringing process is in the
background vty. The visual bell, when chosen, applies to all vtys; other bell types can be set individually for each vty.
-r delay.repeat | speed
Set keyboard delay (250, 500, 750, 1000) and repeat (34, 38, 42, 46, 50, 55, 59, 63, 68, 76, 84, 92, 100, 110, 118, 126, 136, 152,
168, 184, 200, 220, 236, 252, 272, 304, 336, 368, 400, 440, 472, 504) rates, or if a speed argument is specified, it may be one of
slow (1000.504), fast (250.34) or normal (500.126).
Install keyboard map file from keymap_file. You may load the keyboard map file from a menu-driven command, kbdmap(1). The format of
keyboard map files is documented in the kbdmap(5) manual page.
-d Dump the current keyboard map onto stdout. The output may be redirected to a file and can be loaded back to the kernel later by the
-l option above.
-f # string
Set function key number # to send string. Refer to the man page for the keyboard driver (e.g. atkbd(4)) for available function keys
and their numbers.
-F Set function keys back to the standard definitions.
-x Use hexadecimal numbers in keyboard map dump.
-i Print brief information about the keyboard.
-K Disconnect the keyboard from the console. You need to use the -k option below to associate a keyboard with the console again.
Use the specified device as the console keyboard. When using this option, the standard input of the kbdcontrol process should be
redirected from /dev/console if you are not working on the system console (see the EXAMPLES section).
Load keyboard map file from keymap_file and write the struct keymap compiled from it to stdout. This option is primarily intended
for programmers and is probably of little use under normal circumstances.
The environment variable KEYMAP_PATH can hold an alternative path to the keyboard map files.
Boot Time Configuration
You may set variables in /etc/rc.conf or /etc/rc.conf.local in order to configure the keyboard at boot time. The following is the list of
keymap Specifies a keyboard map file for the -l option.
keyrate Sets the keyboard repeat rate for the -r option.
keychange Lists function key strings for the -f option.
See rc.conf(5) for details.
The keyboard device driver may let you change default configuration options, such as the default keyboard map, so that you do not need to set
up the options at boot time. See keyboard driver manuals (e.g. atkbd(4), ukbd(4)) for details.
/usr/share/syscons/keymaps/* keyboard map files for syscons
/usr/share/vt/keymaps/* keyboard map files for vt
The following command will load the keyboard map file /usr/share/syscons/keymaps/ru.koi8-r.kbd.
kbdcontrol -l /usr/share/syscons/keymaps/ru.koi8-r.kbd
So long as the keyboard map file resides in /usr/share/syscons/keymaps (if using syscons(4)) or /usr/share/vt/keymaps (if using vt(4)), you
may abbreviate the file name as ru.koi8-r. Since vt(4) uses Unicode, the corresponding keyboard file names omit the encoding and typically
are just a country code, e.g. ru.
kbdcontrol -l ru.koi8-r
The following command will make the function key 10 emit "telnet myhost".
kbdcontrol -f 10 "telnet myhost"
In order to get the visual effect for bell, but prevent the screen from flashing if the bell is to ring in the background screen, run the
kbdcontrol -b quiet.visual
To change the default console keyboard to another keyboard, for example the first USB keyboard (see ukbd(4)), use the following command.
kbdcontrol -k /dev/ukbd0 < /dev/console
To switch back to the default keyboard, use this command.
kbdcontrol -k /dev/kbd0
To allow using both the second USB keyboard and the first AT keyboard at the same time on console via the kbdmux(4) driver, use the following
sequence of commands.
kbdcontrol -K < /dev/console
kbdcontrol -a atkbd0 < /dev/kbdmux0
kbdcontrol -a ukbd1 < /dev/kbdmux0
kbdcontrol -k /dev/kbdmux0 < /dev/console
kbdmap(1), vidcontrol(1), atkbd(4), kbdmux(4), keyboard(4), screen(4), syscons(4), ukbd(4), vt(4), kbdmap(5), rc.conf(5)
Soren Schmidt <sos@FreeBSD.org>
Report when found.
January 29, 2008 BSD