Difference between revisions of "Xmodmap"

From ArchWiki
Jump to: navigation, search
(Additional resources: rollingrelease.com is some sort of content farm now... :-()
(36 intermediate revisions by 12 users not shown)
Line 1: Line 1:
[[Category:Input devices (English)]] [[Category:X Server (English)]]
+
[[Category:Input devices]]
 +
[[Category:X Server]]
 +
[[fr:Xmodmap]]
 +
{{Article summary start}}
 +
{{Article summary text|A general overview of modifying keymaps and pointer mappings with xmodmap.}}
 +
{{Article summary heading|Related}}
 +
{{Article summary wiki|Xorg}}
 +
{{Article summary wiki|Extra Keyboard Keys}}
 +
{{Article summary wiki|Extra Keyboard Keys in Xorg}}
 +
{{Article summary wiki|Extra Keyboard Keys in Console}}
 +
{{Article summary end}}
  
== Xmodmap ==
+
'''Xmodmap''' is a utility for modifying keymaps and pointer button mappings in [[Xorg]].
  
If you're typing a key on your keyboard, the kernel is generating a code. This code will be compared to a ''table of keycodes'' defining a figure. And it will be displayed i.e. the letter a.
+
== Introduction ==
 +
The Linux kernel generates a code each time a key is pressed on a keyboard. That code is compared to a {{ic|table of keycodes}} defining a figure that is then displayed.
  
With [[X]], it's a bit more comlicated, because it's starting its own table of keycodes. Each keycode can belong to a ''keysym''. A keysym is like a function, started by typing a key. You can edit these keycode-keysym relations with ''xmodmap''.
+
This process is complicated by [[Xorg]], which starts its own table of keycodes. Each keycode can belong to a {{ic|keysym}}. A keysym is like a function, started by typing a key. Xmodmap allows you to edit these keycode-keysym relations.
  
== Structure ==
+
== Keymap table ==
 +
Print the current keymap table formatted into expressions:
 +
{{hc|$ xmodmap -pke|2=keycode  57 = n N}}
  
keycode n = keysym1 keysym2 keysym3 keysym4 keysym5 keysym6
+
Each keymap is followed by the {{Ic|keysyms}} it is mapped to. The above example indicates that the keycode {{ic|57}} is mapped to the lowercase ''n'', while the uppercase ''N'' is mapped to keycode {{Ic|57}} and {{Ic|Shift}}.
n is representing a number. The keysymX stands for:
+
1  only the key
+
2  shift + key
+
3  mode_switch + key
+
4  mode_switch + shift + key
+
5  AltGr + key
+
6  AltGr + shift + key
+
Not all keysyms have to be set. But if you want i.e. keysym5, you have to set keysym1 till keysym5. Therefore, you can use ''NoSymbol'' which is doing nothing.
+
  
Comments start with a ''!''
+
Each keysym column in the table corresponds to a particular key combination:
 +
# {{Keypress|Key}}
 +
# {{Keypress|Shift+Key}}
 +
# {{Keypress|mode_switch+Key}}
 +
# {{Keypress|mode_switch+Shift+Key}}
 +
# {{Keypress|AltGr+Key}}
 +
# {{Keypress|AltGr+Shift+Key}}
  
== Editing ==
+
Not all keysyms have to be set, but if you want to assign a latter keysym without assigning earlier ones set them to {{ic|NoSymbol}}.
  
Extract your actual table of keycodes in a file (here: .xmod)
+
You can check which keymap corresponds to a key on your keyboard with [[Extra Keyboard Keys#Using xev|xev]].
xmodmap -pke > ~/.xmod
+
Now you can edit .xmod. The new .xmod get loaded by
+
xmodmap ~/.xmod
+
'''This has be done after each start of X!''' So put it in your autostart...
+
  
You can get the keycode (and more information) of a key with xev (or xkeycaps). If you start xev within a shell, a window will be opened and if you type a key, there will be some informations about it in the shell. Among others you get the keycode.
+
{{tip|There are predefined descriptive keycodes that make mapping additional keys easier (e.g. {{ic|XF86AudioMute}}, {{ic|XF86Mail}}). Those keycodes can be found in: {{ic|/usr/include/X11/XF86keysym.h}}}}
  
=== Example ===
+
== Custom table ==
 +
You can create your own map and store it in your home directory (i.e. {{ic|~/.Xmodmap}}). Print the current keymap table into a configuration file:
 +
xmodmap -pke > ~/.Xmodmap
  
If I'ld to get an 'e' if I type 'l' and an 'E' if I type 'L', I'ld have to change
+
Make the desired changes to {{ic|~/.Xmodmap}} and then test the new configuration with:
  keycode  46 = l L l L lstroke Lstroke lstroke
+
  xmodmap ~/.Xmodmap
to
+
keycode  46 = e E l L lstroke Lstroke lstroke
+
(Maybe my standard keycode differs from yours. This will be an result of using different keyboard layouts)
+
  
=== Keysym ===
+
To activate your custom table when starting Xorg add the following:
 +
{{hc|~/.xinitrc|
 +
if [ -f $HOME/.Xmodmap ]; then
 +
    /usr/bin/xmodmap $HOME/.Xmodmap
 +
fi}}
  
It is also possible, to change the keysym. I.e:
+
Alternatively, edit the global startup script {{ic|/etc/X11/xinit/xinitrc}}.
[code]
+
keysym a = e E
+
[/code]
+
* a -> e
+
* shift+a -> E
+
It has the same effect as editting the corresponding keycode.
+
 
+
=== xmodmap within a shell ===
+
 
+
Within a shell, you can type make changes for this session. It's useful for testing. Examples:
+
[code]
+
xmodmap -e "keycode  46 = l L l L lstroke Lstroke lstroke"
+
xmodmap -e "keysym a = e E"
+
[/code]
+
  
 +
=== 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 ==
 
== 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 73: Line 73:
 
  keycode  8 =
 
  keycode  8 =
 
  ...
 
  ...
Remember: ! is a comment. So only Control and Mod4 (Standard: Super_L Super_R) get cleared.
+
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 85: Line 85:
 
  add Mod4    = Control_L Control_R
 
  add Mod4    = Control_L Control_R
 
  !add Mod5    =
 
  !add Mod5    =
Here: We changed 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 ==
 +
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 {{ic|~/.Xmodmap}}.
  
== LINKS ==
+
Open {{ic|~/.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.
  
[http://cweiske.de/howto/xmodmap/allinone.html HOWTO]
+
Then update xmodmap:
 +
xmodmap ~/.Xmodmap
  
[http://wiki.archlinux.org/index.php/X xmodmap and mouse]
+
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, [http://who-t.blogspot.com/2011/09/natural-scrolling-in-synaptics-driver.html Natural scrolling in the synaptics driver], or the [https://bbs.archlinux.org/viewtopic.php?id=126258 Reverse scrolling direction ala Mac OS X Lion?] forum thread.
  
[http://wiki.archlinux.org/index.php/Extra_Keyboard_Keys_in_Xorg extra keys]
+
== Additional resources ==
 +
*[http://www.x.org/archive/current/doc/man/man1/xmodmap.1.xhtml Current man page] at X.Org Foundation
 +
*[http://cweiske.de/howto/xmodmap/allinone.html Multimediakeys with .Xmodmap HOWTO] by Christian Weiske
 +
*[http://dev-loki.blogspot.com/2006/04/mapping-unsupported-keys-with-xmodmap.html Mapping unsupported keys with xmodmap] by Pascal Bleser
 +
*[http://en.gentoo-wiki.com/wiki/Multimedia_Keys Multimedia Keys article] on the [http://en.gentoo-wiki.com/ Gentoo Wiki]
 +
*[http://keytouch.sourceforge.net/howto_keyboard/node4.html How to retrieve scancodes] by Marvin Raaijmakers
 +
*[http://wiki.linuxquestions.org/wiki/List_of_Keysyms_Recognised_by_Xmodmap List of Keysyms Recognised by Xmodmap] on [http://linuxquestions.org LinuxQuestions]

Revision as of 11:14, 22 October 2012

Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki Template:Article summary wiki Template:Article summary wiki Template:Article summary wiki Template:Article summary end

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