#!/bin/bash percentage=$(upower -i /org/freedesktop/UPower/devices/battery_BAT1 | grep percentage: | cut -c 26-) state=$(upower -i /org/freedesktop/UPower/devices/battery_BAT1 | grep state: | cut -c 26- | grep -E '^discharging$') if [ -z $state ] then echo $percentage+ else echo $percentage fi