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#!/bin/bash
set -euo pipefail
current=$(brightnessctl -m info | cut -d, -f4 | tr --delete '%')
case $1 in
up)
increment=$(( 5 - ( current % 5 ) ))
new=$(( current + increment ))
if [ $new -gt 100 ]; then
new=100
fi
brightnessctl set $new% > /dev/null 2>&1
echo $new;;
down)
increment=$(( ( ( current - 1 ) % 5 ) + 1 ))
new=$(( current - increment ))
if [ $new -lt 0 ]; then
new=0
fi
brightnessctl set $new% > /dev/null 2>&1
echo $new;;
esac
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