OS X battery monitor script

batt

#!/bin/sh

d=`/usr/sbin/ioreg -c AppleSmartBattery -r | /usr/bin/grep -E "MaxCapacity|CurrentCapacity|ExternalConnected" | /usr/bin/cut -d= -f2`
echo $d | while read MaxC CurC Ext; do
    if [ $Ext = 'Yes' ]; then
	echo "AC"
	exit 0
    else
	p=`echo "scale=2; 100 * $CurC / $MaxC" | /usr/bin/bc`
	echo "Batt $p%"
	exit 1
    fi
done