MacBook Pro Low Battery Notification via Growl

mac-low-battery.sh

#!/bin/bash

PATH=$PATH:/usr/sbin:/usr/local/bin

system_profiler SPPowerDataType | \
    grep '          \(Charging\|Charge Remaining\|Full Charge Capacity\)' | \
    cut -d ':' -f 2 | \
    { read remaining;
    read charging;
    read capacity;
    if [ "$charging" != "Yes" ]
    then
        pctremaining="$(( ${remaining} * 100 / ${capacity} ))";
        if [ $pctremaining -lt 10 ]
        then
            echo "Low Battery: ${pctremaining}% remaining" | growlnotify -s
        fi
    fi;
}