19 lines
563 B
Bash
Executable File
19 lines
563 B
Bash
Executable File
#!/bin/sh
|
|
|
|
## Change the backlight value
|
|
## You need write privileges on /sys/.../brightness
|
|
## This can be achieved via a `udev` rule (see ~/.config/root)
|
|
|
|
current=$(cat /sys/class/backlight/intel_backlight/brightness)
|
|
max=$(cat /sys/class/backlight/intel_backlight/max_brightness)
|
|
step=$(expr $max / 20)
|
|
|
|
[ "$1" = "dec" ] && new=$(expr $current - $step)
|
|
[ "$1" = "inc" ] && new=$(expr $current + $step)
|
|
[ "$1" = "set" ] && new=$(expr $2 \* $step)
|
|
|
|
[ $new -gt 850 ] && new=850
|
|
[ $new -lt 0 ] && new=0
|
|
|
|
echo $new > /sys/class/backlight/intel_backlight/brightness
|