$ /usr/bin/monitor-sensor
    Waiting for iio-sensor-proxy to appear
+++ iio-sensor-proxy appeared
=== Has accelerometer (orientation: normal)
=== Has ambient light sensor (value: 3.967000, unit: lux)
=== No proximity sensor
    Light changed: 5.950000 (lux)
    Light changed: 3.967000 (lux)
    Light changed: 1.983000 (lux)
    Accelerometer orientation changed: left-up
    Accelerometer orientation changed: normal
    Light changed: 5.950000 (lux)
    Light changed: 3.967000 (lux)
    Accelerometer orientation changed: right-up
    Light changed: 5.950000 (lux)
    Light changed: 1.983000 (lux)
    Accelerometer orientation changed: normal
    Light changed: 3.967000 (lux)
^C