$ ./elgato.sh help
usage: ./elgato.sh <on|off|brightness number|temperature number>

$ ./elgato.sh on
My Key Light (my-key-light.local.:9123)
=======================================
brightness:   50
on:           1
temperature:  250

$ ./elgato.sh off

$ ./elgato.sh toggle

$ ./elgato.sh brightness 10

$ ./elgato.sh temperature 25

$ ./elgato.sh brightness +10

$ ./elgato.sh temperature -15

$ ./elgato.sh brightness +10 temperature 200 on

$ ./elgato.sh off toggle toggle on brightness +5 brightness 20 brightness -5