Battery status cmd for mac os x

battery.sh

#!/bin/sh
isFullyCharged=`ioreg -n AppleSmartBattery | grep FullyCharged | awk '{ print $5 }'` 
timeLeft=`ioreg -n AppleSmartBattery | grep TimeRemaining | awk '{ print $5 }'` 
isCharging=`ioreg -n AppleSmartBattery | grep IsCharging | awk '{ print $5 }'`

if [ $isFullyCharged = "Yes" ] ; then 
  output="Full Charge" 
else 
  output="$timeLeft mins" 
  if [ $isCharging = "Yes" ] ; then
    output="$output till charge"
  else
    output="$output till drain"
  fi
fi

echo $output