-----
$ cat a
#!/bin/sh

echo "1: $1"
echo "2: $2"
echo "3: $3"

echo "b:"
./b $@

echo "b:"
./b $@
-----

-----
$ cat b
#!/bin/sh

echo "1: $1"
echo "2: $2"
echo "3: $3"
-----

-----
$ ./a x 'y a' z
1: x
2: y a
3: z
b:
1: x
2: y
3: a
b:
1: x
2: y
3: a
-----

-----
$ cat a
#!/bin/sh

echo "1: $1"
echo "2: $2"
echo "3: $3"

echo "b:"
./b $@

echo "b:"
./b "$@"
-----

-----
$ ./a x 'y a' z
1: x
2: y a
3: z
b:
1: x
2: y
3: a
b:
1: x
2: y a
3: z
-----