xmodmap

Utility for modifying keymaps and pointer button mappings in X. More information: https://manned.org/xmodmap.

Swap <LeftClick> and <RightCLick> 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}}