usage de getopts

# getopts
while getopts 'c:d:' OPTION
do
        case $OPTION in
        c)      client=$OPTARG
                        ;;
        d)      date=$OPTARG
                        ;;
        ?)      printf "Usage: %s: [-c client] [-d YYYY-mm-dd]\n" $(basename $0) >&2
                        exit 2
                        ;;
        esac
done
shift $(($OPTIND - 1))