evtest — Display information from input device drivers. More information: <https://manned.org/evtest>.

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}}