Check and control LCD screen brightness values from the command line.
brightscreen.sh
This script is meant to provide a way to regulate brightness of LCDs from the command line. It is being developed on a Lenovo IdeaPad Y50-70 Touch, the display of which is controllable via /sys/class/backlight/.
The current and maximum brightness levels can be checked by any user but root privileges are required to change the level. Run with sudo as necessary.
YMMV