#!/bin/sh # Get battery percentage from /sys/class/power_supply/BAT0/capacity BATTERY=$(cat /sys/class/power_supply/BAT0/capacity) STATUS=$(cat /sys/class/power_supply/BAT0/status) echo $BATTERY echo $STATUS # Only shutdown if on battery (discharging) and low if [ "$STATUS" = "Discharging" ] && [ "$BATTERY" -lt 15 ]; then systemctl poweroff fi