Actually I believe being a sysops/devops or whatever you want to call it is one of the "most" challenging jobs in the IT industry. You get zillions of technologies you have to administer and maintain but it's impossible to master all of them. What makes a good admin is the ability to learn,adapt,ask for a help and knowing where to look for an answer. It's easy to look up the parameters if you know the fundamentals.
Interviewing for me as a devops person is one of the most frustrating experiences. You are often asked questions that are specific to the environment of a company you are interviewing with. It's unbelievable how many times I've been asked about parameters of tar, du etc. It's totally stupid. And imagine interviewing with a company that uses only a specific subset of technologies and they heavily emphasize on that.