9.4.11 Keymaps and pointer button mappings in X

The xmodmap program is used to edit and display the keyboard modifier map and keymap table that are used by client applications to convert event keycodes into keysyms in X.

     $ xmodmap -pm 
      ... display the current modifier map
     $ xmodmap -pk | pager
      ... display the current keymap table
     $ xmodmap -e "pointer = 3 2 1" # set mouse for the left hand.
     $ xmodmap ~/.xmodmaprc # set keyboard as in ~/.xmodmaprc

It is usually run from the user's session startup script, ~/.xsession.

To get the keycode, run xev in X and press keys. To get the meaning of keysym, look into the MACRO definition in /usr/include/X11/keysymdef.h file. All the #define statements in this file are named as XK_ prepended to the keysym names.

See xmodmap(1x).