This is how I do it:
DEVICE_ID=$(xinput | grep "Synaptics" | cut -d = -f 2 | cut -d ' ' -f 1)
xinput set-prop $DEVICE_ID 279 -114 -114
This is how I do it:
DEVICE_ID=$(xinput | grep "Synaptics" | cut -d = -f 2 | cut -d ' ' -f 1)
xinput set-prop $DEVICE_ID 279 -114 -114