#!/bin/bash

# File paths
BRIGHTNESS_FILE="/sys/class/backlight/intel_backlight/brightness"
MAX_BRIGHTNESS_FILE="/sys/class/backlight/intel_backlight/max_brightness"

# Read the current brightness and maximum brightness values
current_brightness=$(cat "$BRIGHTNESS_FILE")
max_brightness=$(cat "$MAX_BRIGHTNESS_FILE")

# Check if max_brightness is greater than 0 to avoid division by zero
if [ "$max_brightness" -le 0 ]; then
  echo "Error: Max brightness is not a positive number."
  exit 1
fi

# Calculate the brightness percentage and round to the nearest whole number
brightness_percentage=$(echo "scale=0; ($current_brightness * 100 / $max_brightness)" | bc)

# Output the brightness percentage
echo "Backlight: ${brightness_percentage}%"