PL/SQL is an Oracle database server language.
It does not care whether the database runs on Unix or Windows or Linux.
So there is no such thing as a "Unix PL/SQL" or "Windows PL/SQL" example. Unless something unique to the underlying o/s is done, such as defining external libraries.
PL/SQL code should also be inside the database. Storing large chunks of PL/SQL code in raw text format on a client and then sending that to the server for compilation each time around, is flawed. And a security concern.