Difference between revisions of "Xmodmap"

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m (Custom table)
m (Special keys/signals)
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== Special keys/signals ==
 
== Special keys/signals ==
  
You can also also edit the keys: shift, ctrl alt and super (there always exists a left and a right one (Alt_R=AltGr))
+
You can also also edit the keys: {{Keypress|Shift}}, {{Keypress|Ctrl}}, {{Keypress|Alt}} and {{Keypress|Super}} (there always exists a left and a right one (Alt_R=AltGr))
  
At first you have to delete/clear the signals that should be edited. Write at the beginning of your Xmodmap file (here: ~/.xmod) :
+
At first you have to delete/clear the signals that should be edited. In the beginning of your {{ic|~/.Xmodmap}}:
 
  !clear Shift
 
  !clear Shift
 
  !clear Lock
 
  !clear Lock
Line 75: Line 75:
 
  keycode  8 =
 
  keycode  8 =
 
  ...
 
  ...
Remember: ! is a comment. So only Control and Mod4 (Standard: Super_L Super_R) get cleared.
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Remember, {{ic|!}} is a comment so only {{Keypress|Control}} and {{Keypress|Mod4}} (Standard: Super_L Super_R) get cleared.
  
Write the new signals at the end of ~/.xmod:
+
Write the new signals at the end of {{ic|~/.Xmodmap}}
 
  keycode 255 =
 
  keycode 255 =
 
  !add Shift  = Shift_L Shift_R
 
  !add Shift  = Shift_L Shift_R
Line 87: Line 87:
 
  add Mod4    = Control_L Control_R
 
  add Mod4    = Control_L Control_R
 
  !add Mod5    =
 
  !add Mod5    =
Here: We exchanged the Super-keys with the ctrl-keys. My lil' finger likes that really ;).
+
The {{Keypress|Super}} keys have now been exchanged with the {{Keypress|Ctrl}} keys.
  
 
== Reverse Scrolling ==
 
== Reverse Scrolling ==

Revision as of 11:02, 6 March 2012

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Summary help replacing me
A general overview of modifying keymaps and pointer mappings with xmodmap.
Related
Xorg
Extra Keyboard Keys
Extra Keyboard Keys in Xorg
Extra Keyboard Keys in Console

Xmodmap is a utility for modifying keymaps and pointer button mappings in Xorg.

Introduction

The Linux kernel generates a code each time a key is pressed on a keyboard. That code is compared to a table of keycodes defining a figure that is then displayed.

This process is complicated by Xorg, which starts its own table of keycodes. Each keycode can belong to a keysym. A keysym is like a function, started by typing a key. Xmodmap allows you to edit these keycode-keysym relations.

Keymap table

Print the current keymap table formatted into expressions:

$ xmodmap -pke
keycode  57 = n N

Each keymap is followed by the keysyms 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 57 and Shift.

Each keysym column in the table corresponds to a particular key combination:

  1. Template:Keypress
  2. Template:Keypress
  3. Template:Keypress
  4. Template:Keypress
  5. Template:Keypress
  6. Template:Keypress

Not all keysyms have to be set, but if you want to assign a latter keysym without assigning earlier ones set them to NoSymbol.

You can check which keymap corresponds to a key on your keyboard with xev.

Tip: There are predefined descriptive keycodes that make mapping additional keys easier (e.g. XF86AudioMute, XF86Mail). Those keycodes can be found in: /usr/include/X11/XF86keysym.h

Custom table

You can create your own map and store it in your home directory (i.e. ~/.Xmodmap). Print the current keymap table into a configuration file:

xmodmap -pke > ~/.Xmodmap

Make the desired changes to ~/.Xmodmap and then test the new configuration with:

xmodmap ~/.Xmodmap

To activate your custom table when starting Xorg add the following:

~/.xinitrc
if [ -f $HOME/.Xmodmap ]; then
    /usr/bin/xmodmap $HOME/.Xmodmap
fi

Alternatively, edit the global startup script /etc/X11/xinit/xinitrc.

Test changes

You can also make temporary changes for the current session. For example:

xmodmap -e "keycode  46 = l L l L lstroke Lstroke lstroke"
xmodmap -e "keysym a = e E"

Special keys/signals

You can also also edit the keys: Template:Keypress, Template:Keypress, Template:Keypress and Template:Keypress (there always exists a left and a right one (Alt_R=AltGr))

At first you have to delete/clear the signals that should be edited. In the beginning of your ~/.Xmodmap:

!clear Shift
!clear Lock
clear Control
!clear Mod1
!clear Mod2
!clear Mod3
clear Mod4
!clear Mod5
keycode   8 =
...

Remember, ! is a comment so only Template:Keypress and Template:Keypress (Standard: Super_L Super_R) get cleared.

Write the new signals at the end of ~/.Xmodmap

keycode 255 =
!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 Template:Keypress keys have now been exchanged with the Template:Keypress keys.

Reverse Scrolling

The natural scrolling feature available in OS X Lion can be mimicked 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 .Xmodmap.

Open ~/.Xmodmap and append the following line to the file:

pointer = 1 2 3 5 4 7 6 8 9 10 11 12

Note how the 4 and 5 have been reversed.

Then update xmodmap:

# xmodmap ~/.Xmodmap

To return to regular scrolling simply reverse the order of the 4 and 5 or delete the line altogether. For more information check Peter Hutterer's post, Natural scrolling in the synaptics driver, or the Reverse scrolling direction ala Mac OS X Lion? forum thread.

Additional resources