[zomglings]

Tab completion makes CLIs more discoverable.

It still places some responsibility on the developer of the command line tool to expose a reasonable interface. But if they do so, users can learn the interface by tab-ing their way to glory.

The Google Cloud SDK (gcloud command-line tool) is a really great example of this. It was the first cloud infrastructure I worked on and I learned how Google Cloud worked by tab-completing gcloud commands and reading the --help pages.

AWS CLI is an example of when too much complexity is exposed to the user. They have similar tab completion functionality, but they provide such fine grained control that it is hard to use it to learn the services themselves.