Many unix commands, especially many listed here, are most useful when used in conjunction with others, like this:
You're the new guy they just hired to replace him. Who cares about CNAMEs when you're on the server looking at the hostname? Someone tells you 'daffy' and 'kirk' are down. What are they? What do they do?
Luckily your company is certified ISO 9000 and everything you need to know to do someone else's job is well documented.
The trouble with computers is that they do what you tell them, not what you want. -- D. Cohen