Command Line Aliases are currently only available on Windows.
Let's say that you have a skill with a set of parameters that want to reuse through the CLI, for example, you might want to add a specific text in the top left corner of an image. After running a skill you can save this recipe as a Command Line Alias. You find the tool to create such aliases in the Automate menu.
After creating an alias, the name specified is then available as a command on your terminal with the same arguments as the CLI.