dotfiles/local-bin/dec-brightness

#!/bin/sh

# script to decrease the display brightness by 5%

device=$(brightnessctl -l | grep "class 'backlight'" | tail -n +3 | awk '{print $2}' | tr -d "'")
if brightnessctl -l | grep "class 'backlight'" | grep -q "^Device 'acpi_video0'"; then
    device="acpi_video0"
fi

brightness=$(brightnessctl -d "${device}" | grep Current | awk -F '[)(]' '{print $2 - 5}')

brightnessctl -d "${device}" set "$brightness"%