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I think that most interviewers will happily give you the definition of strcmp if you don't already know it. If you're not a bad web developer, you'll happily come up with some code on a whiteboard that meets the definition.

Anecdotally, perhaps, 95% of professional programmers don't know the definition of the words, "Lyskov Substitution Principle". That's not the same as not knowing what it is.

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Two weeks ago I interviewed at a subsidiary of a major web property, and "[w]hat is the Lyskov Substitution Principle?" was on a written test they gave me.

I would have told them that I had no idea what that was, but then told them what the "Liskov Substitution Principle" (named after Barbara Liskov of MIT) was. I mean seriously, if a company can't spell, do you want to work there? :-)

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