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64 lines
1.7 KiB
Bash
Executable file
64 lines
1.7 KiB
Bash
Executable file
#!/bin/sh
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BRIGHTNESS_FILE="/sys/class/backlight/intel_backlight/brightness"
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BRIGHTNESS_MAX=937
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function change_brightness() {
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BRIGHTNESS=$(cat $BRIGHTNESS_FILE)
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change_value=$2
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# If we're dealing with percentages, convert to absolutes
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if [ $3 == "%" ]; then
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change_value=$((($BRIGHTNESS_MAX / 100) * $change_value))
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elif [ $3 == "#" ]; then
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change_value=$change_value
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else
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echo "Invalid unit, options: [% - percent, # - absolute], default: %"
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exit 1
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fi
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# Increment or decrement based on first arg
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if [ $1 == "+" ]; then
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new_brightness=$(($BRIGHTNESS + $change_value))
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elif [ $1 == "-" ]; then
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new_brightness=$(($BRIGHTNESS - $change_value))
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else
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echo "Invalid operator, options: [+, -]"
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exit 1
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fi
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# Make sure we respect min/max boundaries
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if [ $new_brightness -lt 0 ]; then
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new_brightness=0
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elif [ $new_brightness -gt $BRIGHTNESS_MAX ]; then
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new_brightness=$BRIGHTNESS_MAX
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fi
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# Write the brightness (sudo shouldn't require password here)
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echo $new_brightness | sudo tee $BRIGHTNESS_FILE
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}
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if [ $# -ge 1 ] && [ "$1" == "+" ] || [ "$1" == "-" ]; then
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if [ $# -lt 2 ]; then
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change_value=5 # Default to 5%
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else
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change_value=$2
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fi
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if [ $# -lt 3 ]; then
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unit="%"
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else
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unit=$3
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fi
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change_brightness $1 $change_value $unit > /dev/null
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fi
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# Display new brightness
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BRIGHTNESS=$(cat $BRIGHTNESS_FILE)
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BRIGHTNESS_PERCENT=$(echo "($BRIGHTNESS / $BRIGHTNESS_MAX) * 100" | bc -l)
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BRIGHTNESS_PERCENT=$(printf "%.2f" $BRIGHTNESS_PERCENT)
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echo "Brightness: ${BRIGHTNESS_PERCENT}% (absolute: $BRIGHTNESS)"
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