Bash functions, unlike functions in most programming languages do not allow you to return a value to the caller. When a bash function ends its return value is its status: zero for success, non-zero ...

Functions that return multiple values are hard to name clearly. It's easy to mistake the order of the return values. (password, username) = GetUsernameAndPassword() ...

The dynamic array function, UNIQUE() has been around for a while, so it’s possible that you already know how to use it. If that’s the case, feel free to skip this section.