### Question 11.13

But what about `main`'s third argument, `envp`?

It's a non-standard (though common) extension. If you really need to access the environment in ways beyind what the standard `getenv` function provides, though, the global variable `environ` is probably a better avenue (though it's equally non-standard).

References: ANSI Sec. F.5.1
ISO Sec. G.5.1
H&S Sec. 20.1 pp. 416-7

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