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21 lines
574 B
21 lines
574 B
4 years ago
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#!/bin/sh
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brightness_dir="/sys/class/backlight/intel_backlight/brightness"
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max_brightness=`cat /sys/class/backlight/intel_backlight/max_brightness`
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current_brightness_level=`cat $brightness_dir`
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new_brightness_level=`expr $current_brightness_level + $1`
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if [ "$1" -ge 0 ]; then
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if [ "$new_brightness_level" -le "$max_brightness" ]; then
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echo $new_brightness_level > $brightness_dir
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else
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echo $max_brightness > $brightness_dir
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fi
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else
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if [ "$new_brightness_level" -ge 0 ]; then
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echo $new_brightness_level > $brightness_dir
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else
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echo 0 > $brightness_dir
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fi
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fi
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