xmodmap is a utility for modifying keymaps and pointer button mappings in Xorg.
xmodmap is not directly related to X KeyBoard extension (XKB), as it uses different (pre-XKB) ideas on how keycodes are processed within X. Generally, it is only recommended for the simplest tasks. See X KeyBoard extension for advanced layout configuration.
- 1 Introduction
- 2 Installation
- 3 Keymap table
- 4 Custom table
- 5 Modifier keys
- 6 Reverse scrolling
- 7 Swapping mouse buttons
- 8 Templates
- 9 See also
There are two types of keyboard values in Xorg: keycodes and keysyms.
- The keycode is the numeric representation received by the kernel when a key or a mouse button is pressed.
- The keysym is the value assigned to the keycode. For example, pressing
keycode 73, which is mapped to the
keysym 0×61, which matches
Ain the ASCII table.
- The keysyms are managed by Xorg in a table of keycodes defining the keycode-keysym relations, which is called the keymap table. This can be shown by running
Optionally, install, which is a graphical front-end to xmodmap.
Print the current keymap table formatted into expressions:
$ xmodmap -pke
[...] keycode 57 = n N [...]
Each keycode is followed by the keysym it is mapped to. The above example indicates that the keycode
57 is mapped to the lowercase
n, while the uppercase
N is mapped to keycode
Each keysym column in the table corresponds to a particular combination of modifier keys:
Not all keysyms have to be set, but to assign only a latter keysym, use the
To see which keycode corresponds to a key, see Extra keyboard keys#In Xorg for details on the xev utility which will output relevant keycode/keysym information about a key when you press it.
Note that xmodmap is influenced by xkbd settings, so all eight keysym are available for the us(intl) xkbd layout but not for the default us (it is missing the ralt_switch symbol defined in level3). To have all 8 keysyms available you should configure the (intl) variant of the keyboard from xorg.conf or add, using us layout as an example,
setxkbmap -layout 'us(intl)' before calling xmodmap.
To create a key map (i.e.
$ xmodmap -pke > ~/.Xmodmap
To test the changes:
$ xmodmap ~/.Xmodmap
Activating the custom table
if [ -s ~/.Xmodmap ]; then xmodmap ~/.Xmodmap fi
Alternatively, edit the global startup script
To make temporary changes:
$ xmodmap -e "keycode 46 = l L l L lstroke Lstroke lstroke" $ xmodmap -e "keysym a = e E"
Before assignment the modifier keys need to be empty.
! is a comment, so only the modifiers
Mod4 get cleared in the following example. Then the keysyms
Super_R are assigned to the opposite modifier. Assigning both left and right to the same modifier means that both keys are treated the same way.
[...] !clear Shift !clear Lock clear Control !clear Mod1 !clear Mod2 !clear Mod3 clear Mod4 !clear Mod5 !add Shift = Shift_L Shift_R !add Lock = Caps_Lock add Control = Super_L Super_R !add Mod1 = Alt_L Alt_R !add Mod2 = Mode_switch !add Mod3 = add Mod4 = Control_L Control_R !add Mod5 =
The following example modifies
clear lock clear control add control = Caps_Lock Control_L Control_R keycode 66 = Control_L Caps_Lock NoSymbol NoSymbol
The natural scrolling feature available in OS X Lion (mimicking smartphone or tablet scrolling) can be replicated with xmodmap. Since the synaptics driver uses the buttons 4/5/6/7 for up/down/left/right scrolling, you simply need to swap the order of how the buttons are declared in
pointer = 1 2 3 5 4 7 6 8 9 10 11 12
Then update xmodmap:
$ xmodmap ~/.Xmodmap
The left, middle and right mouse buttons correspond to buttons 1,2 and 3 respectively in the synaptics driver. To swap left and right mouse buttons, again simply reverse the order in which they are listed in your
pointer = 3 2 1
This should suffice for a simple mouse setup. Again, update xmodmap:
$ xmodmap ~/.Xmodmap
keycode 24 = a A aacute Aacute ae AE ae keycode 26 = e E eacute Eacute EuroSign cent EuroSign keycode 30 = u U uacute Uacute downarrow uparrow downarrow keycode 31 = i I iacute Iacute rightarrow idotless rightarrow keycode 32 = o O oacute Oacute oslash Oslash oslash keycode 57 = n N ntilde Ntilde n N n keycode 58 = comma question comma questiondown dead_acute dead_doubleacute dead_acute keycode 61 = exclam section exclamdown section dead_belowdot dead_abovedot dead_belowdot !Maps the Mode key to the Alt key keycode 64 = Mode_switch
Turn CapsLock into Control, and LeftControl into Hyper
Laptop users may prefer having
Left Hyper key can be used as a modifier.
clear lock clear control clear mod1 clear mod2 clear mod3 clear mod4 clear mod5 keycode 37 = Hyper_L keycode 66 = Control_L add control = Control_L Control_R add mod1 = Alt_L Alt_R Meta_L add mod2 = Num_Lock add mod3 = Hyper_L add mod4 = Super_L Super_R add mod5 = Mode_switch ISO_Level3_Shift
Switch every number key N with Shift-N and vice-versa, for Croatian layout
Should work fine for layouts similar to Croatian as well.
keycode 10 = exclam 1 1 exclam asciitilde dead_tilde asciitilde keycode 11 = quotedbl 2 2 quotedbl dead_caron caron dead_caron keycode 12 = numbersign 3 3 numbersign asciicircum dead_circumflex asciicircum keycode 13 = dollar 4 4 dollar dead_breve breve dead_breve keycode 14 = percent 5 5 percent degree dead_abovering degree keycode 15 = ampersand 6 6 ampersand dead_ogonek ogonek dead_ogonek keycode 16 = slash 7 7 slash grave dead_grave grave keycode 17 = parenleft 8 8 parenleft dead_abovedot abovedot dead_abovedot keycode 18 = parenright 9 9 parenright dead_acute apostrophe dead_acute keycode 19 = equal 0 0 equal dead_doubleacute doubleacute dead_doubleacute