Individual shell tools exercises

### Link to the coursework

https://github.com/CodeYourFuture/Module-Tools/tree/main/individual-shell-tools

### Why are we doing this?

We use shell tools every day when writing software. Understanding them, and being fluent thinking about them, is an important skill.

Also, using shell tools encourages us to think about how we can break problems down into smaller sub-problems, which someone else may have already solved, saving us time solving them ourselves.

### Maximum time in hours

4

### How to submit

Submit a PR from your fork of the Module-Tools repo with the answers added to the files.