getopt long type

http://www.missiondata.com/blog/system-administration/17/17/

set -- `getopt -n$0 -u -a --longoptions="depth: adddays: topN:" "h" "$@"` || usage
[ $# -eq 0 ] && usage
while [ $# -gt 0 ]
do
    case "$1" in
       --depth)   depth=$2;shift;;
       --adddays) adddays=$2;shift;;
       --topN)    topN=$2;shift;;
       -h)        usage;;
       --)        shift;break;;
       -*)        usage;;
       *)         break;;            #better be the crawl directory
    esac
    shift
done