Case statements allow your scripts to react differently depending on what values are being examined.

Many bash scripts use arguments to control the commands that they will run and the information that will be provided to the people running them. This post examines a number of ways that you can ...

I've recently written about using bash arrays and bash regular expressions, so here's a more useful example of using them to test IP addresses for validity. To belabor the obvious: IP addresses are 32 ...

In the examples directory, you can even see how to embed gum inside things like Python or Ruby. Sure, there are tools like dialog, and for more advanced scripts, you might need that.