Good stuff. I would agree with learning the implementation of a UNIX, but not for the reason you gave (ubiquity). Instead, learn it because of the philosophies

Good stuff. I would agree with learning the implementation of a UNIX, but not for the reason you gave (ubiquity). Instead, learn it because of the philosophies about software design it created, and which developers (often) live by today: do the simplest thing that could possibly work; create small parts that do one thing and one thing only; favor simplicity over correctness. Also because it will give you insight into C, and vice versa.