set -- 1 2

IFS=

a=$* b=${*}
c=${*/} d=${*#} e=${*%} f=${*:1}
printf '<%s>' "$a" "$b" "$c" "$d" "$e" "$f"; echo

unset a b c d e f
: ${a=$*} ${b=${*}} ${c=${*/}}
: ${d=${*#}} ${e=${*%}} ${f=${*:1}}
printf '<%s>' "$a" "$b" "$c" "$d" "$e" "$f" ; echo

unset f g
f=${*,,} g=${*@Q}
printf '<%s>' "$f" "$g" ; echo