evtest
Display information from input device drivers.
TLDR
List all detected input devices
$ sudo evtest
Display events from a specific input device
$ sudo evtest /dev/input/event[number]
Grab the device exclusively, preventing other clients from receiving events
$ sudo evtest --grab /dev/input/event[number]
Query the state of a specific key or button on an input device
$ sudo evtest --query /dev/input/event[number] [event_type] [event_code]
