first, install xinput: sudo apt-get install xinput
xinput list => show all input devices
xinput list-props $dev_id => show all options of $dev_id
xinput set-int-prop $dev_id "$opt" 8 $value => set integer value to option $opt,
xinput set-int-prop $touchpad "Device Enabled" 8 0
xinput set-int-prop $trackpoint "Evdev Wheel Emulation" 8 1
xinput set-int-prop $trackpoint "Evdev Wheel Emulation Button" 8 2
xinput set-int-prop $trackpoint "Evdev Middle Button Emulation" 8 1
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