Positional parameters follow the command name in a prescribed sequence.

You must specify required positional parameters immediately after the command name to which they apply. When using optional positional parameters, you must specify them immediately after any required positional parameters or after the command name if no required positional parameter exists. When a positional parameter is a list of items, you must enclose the list within parentheses. However, if you specify only one item, you have the option of using parentheses.