bar.sh

#!/bin/bash
echo $1;
while shift; do
	echo $1;
done

barbaz.txt

+ foo='a b c '\''*'\'' d e f'
+ echo 'no quotes'
no quotes
+ ./bar.sh a b c ''\''*'\''' d e f
a
b
c
'*'
d
e
f

+ echo quotes
quotes
+ ./bar.sh 'a b c '\''*'\'' d e f'
a b c '*' d e f

baz.sh

#!/bin/bash
set -x
foo="a b c '*' d e f"
echo "no quotes"
./bar.sh $foo
echo "quotes"
./bar.sh "$foo"