TLDR
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xmodmap

 
Utility for modifying keymaps and pointer button mappings in X. More information: https://manned.org/xmodmap.
 
  • Swap left-click and right-click on the pointer:
     
    xmodmap -e 'pointer = 3 2 1'
     
  • Reassign a key on the keyboard to another key:
     
    xmodmap -e 'keycode {{keycode}} = {{keyname}}
     
  • Disable a key on the keyboard:
     
    xmodmap -e 'keycode {{keycode}} ='
     
  • Execute all xmodmap expressions in the specified file:
     
    xmodmap {{path/to/file}}

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