Switch and router OSes have a unique CLI configuration system that is both simple and quite powerful. Compared to Linux I especially like the ability to enumerate the entire configuration with one command ("show running-config" in Cisco's IOS, for example).

I would love to be able to see and manage a Linux system's configuration in an analogous way. Obviously there's a lot more to a modern general purpose OS than a simple network device, so I'm not sure, maybe it wouldn't work very well?