Bash script for linux to show you how worn your battery is

battery_info.sh

#!/bin/bash
bats=`ls /proc/acpi/battery/`;
for bat in $bats;do 
	remain=`cat /proc/acpi/battery/$bat/{info,state}|grep remaining|grep -o "[0-9]\+"`
	full=`cat /proc/acpi/battery/$bat/{info,state}|grep full |grep -o "[0-9]\+"`
	descap=`cat /proc/acpi/battery/$bat/{info,state}|grep "design capacity:" |grep -o "[0-9]\+"`
	rate=`cat /proc/acpi/battery/$bat/{info,state}|grep "present rate:" |grep -o "[0-9]\+"`
	state=`cat /proc/acpi/battery/$bat/{info,state}|grep "charging state:" |grep -o "[a-z]\+$"`
	echo $state;
	lostcap=$((((descap-full)*100)/descap));
	echo "Lost Capacity:" $lostcap"%"
	percfull=$(((remain)*100/full));
	echo "Percent Full: " $percfull"%"
	if [[ "$rate" -ne 0 ]]; then
		if [[ "$state" = 'discharging' || "$state" = 'charged' ]]; then
			timeleft=$((((remain)*60)/rate))
			echo "Time left to run: "$timeleft" minutes"
		else
			timeleft=$((((full-remain)*60)/rate))
			echo "Time left to full: "$timeleft" minutes"
		fi
	fi;
done