The $" n parameter refers to the nth positional parameter in the alias invocation, quoted as necessary to form a valid string term for expressions. This is most useful for providing an alias wrapper for a user-defined or built-in function. For example,

allows the alias to be invoked as any of the following:

Since aliases use the older convention of doubling string delimiters instead of the C-style backslash escape (that is, \"), you must double the delimiter to get an embedded quote. For example,

would expand to