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#!/bin/bash
[[ -n "$BACKLIGHT" ]] || BACKLIGHT=intel_backlight
fmax=/sys/class/backlight/$BACKLIGHT/max_brightness
fcur=/sys/class/backlight/$BACKLIGHT/brightness
read max < $fmax || exit $?
case $# in
0)
read cur < $fcur
bc <<<"100*$cur/$max" | cut -d. -f1
;;
1)
declare -i pct="$1"
bc <<<"$max*$pct/100" | cut -d. -f1 > $fcur
;;
*)
echo "Usage: [BACKLIGHT=<device_id>] backlight [<percent>]" >&2
exit 1
;;
esac
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