+while getopts ":b:d:s:" opt
+do
+ case "$opt" in
+ b)
+ SCREEN_BRIGHTNESS_DEVICE_NAME="$OPTARG"
+ ;;
+ d)
+ DISK_IO_DEVICE="$OPTARG"
+ ;;
+ s)
+ DISK_SPACE_DEVICE="$OPTARG"
+ ;;
+ \?)
+ echo "Unknown option: $OPTARG" >&2
+ exit 1
+ ;;
+ :)
+ echo "Missing argument for option: $OPTARG" >&2
+ exit 1
+ ;;
+ esac
+done
+if [ "$SCREEN_BRIGHTNESS_DEVICE_NAME" == '' ]; then echo 'Missing -b' >&2; exit 1; fi
+if [ "$DISK_IO_DEVICE" == '' ]; then echo 'Missing -d' >&2; exit 1; fi
+if [ "$DISK_SPACE_DEVICE" == '' ]; then echo 'Missing -s' >&2; exit 1; fi