set -- ' A ' ' B '
IFS=

printf '<%s>' ${*} ${*##}
echo
printf '<%s>' ${*} ${*/}
echo
printf '<%s>' ${*} ${*,,}
echo
printf '<%s>' ${*} ${*:1:2}
echo
printf '<%s>' ${*} ${*@Q}
echo

echo -----

printf '<%s>' ${@} ${@##}
echo
printf '<%s>' ${@} ${@/}
echo
printf '<%s>' ${@} ${@,,}
echo
printf '<%s>' ${@} ${@:1:2}
echo
printf '<%s>' ${@} ${@@Q}
echo