- #!/bin/dash
- device_dir="/sys/class/backlight/intel_backlight"
- curr_brightness=$(cat "${device_dir}/brightness")
- max_brightness=$(cat "${device_dir}/max_brightness")
- step=$(($max_brightness / 10))
- if [ $1 ]; then new_brightness=$(($curr_brightness + $step))
- else new_brightness=$(($curr_brightness - $step)); fi
- if [ $new_brightness -gt $max_brightness ]; then new_brightness="$max_brightness"; fi
- if [ $new_brightness -lt 1 ]; then new_brightness=1; fi
- echo $new_brightness > "${device_dir}/brightness"
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