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#!/bin/bash
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DEV=/sys/class/backlight/backlight
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BL=$(cat $DEV/brightness)
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MAX=$(cat $DEV/max_brightness)
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if [ $BL -lt 5 ]; then
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BL=$((BL + 1))
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else
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BL=$((BL + ( BL / 4 )))
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fi
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if [ $BL -gt $MAX ]; then
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BL=$MAX
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fi
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echo $BL > $DEV/brightness |