Shell

Every operating system, by definition, has some sort of interface to work with. Most people use the graphical user interface (GUI), as it is easy to understand and navigate, and does not require any specific knowledge. However, graphical interfaces are complex, demanding, and not reproducible. Even before the GUI existed, programmers used code-based interfaces to interact with computers—shells. Both macOS and Linux systems are Unix-based and, hence, leverage the same shell interface, Bash. Windows, on the other hand, has two, a very basic command prompt, and a PowerShell (which we recommend using). There are also ways to install and use Bash on Windows. All those systems allow you to create, change, and delete files and folders, run programs and utilities, and so on. In addition, because those systems are based on textual commands (code, essentially), commands can...