Basic array manipulation

The thing with bash and variables in bash is that they look deceptively simple. There are no formal declarations of type, or basically declarations of any kind. Typing is done by the shell itself, and we can do a lot of things implicitly. This is especially true for regular variables. Arrays are a little bit more complex, and they offer a few syntactic peculiarities when used, but they are an extremely useful tool. You may wonder why we are even mentioning them in any context since they are nothing more than one value under the same variable name. Well, the main reason is that we often actually need exactly this. A lot of times, we must store multiple values that belong to some set of data. Typically, that will be something such as an unordered list of values in case it is something that we do not care about having in a particular order, or an ordered list of values if we do.

Getting ready

Usually, arrays are defined as one-dimensional indexed arrays...