Chapter 2

1. Three

This is because the whole bash shebang is primarily a comment, so there are three lines of comment.

2. There is no space between the option -b and its value, so it will be treated as an option.

-a
-b50
-c

3. 1

Four

This is because we have five passed parameters and we use the shift to drop a parameter.

4. 2

-n

This is because it's on the left and the shift command drops parameters from the left.