A bash function that sends a pushbullet notification when a command completes

pb_notify.sh

function pb_notify {
    start=`date +%s%N`
    "$@"
    end=`date +%s%N`
    start_ms=`echo $start | head -c 13`
    end_ms=`echo $end | head -c 13`
    dt_ms=$[(end_ms-start_ms)]
    if which bc >/dev/null 2>&1
    then
        dt=`echo "scale=3;$dt_ms/1000.0" | bc`
    else
        dt=$[dt_ms/1000]
    fi
    pb push "Command completed at `date` in $dt seconds"
}