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