CLUI: Building a Graphical Command Line has a nice article on using the command-line for graphical programs. It goes into some good discussion on the command-line and GUI interfaces and how they differ and what each expects. It's very interesting if you've never thought about it before.

It was this …

cmd — Line-oriented Command Processors

Here is a link that explains some stuff that I apparently missed earlier, but it could also be that, since this is for Python 3, I could have skipped it, as, at the time, I needed to support Python 2 as well.

Anyway, the cmd — Line-oriented …