I'll add The Unix Programming Environment, by Kernighan and Pike. Like K&R, the examples it picks "happen" to teach so much more than you came to learn :), e.g

I'll add The Unix Programming Environment, by Kernighan and Pike. Like K&R, the examples it picks "happen" to teach so much more than you came to learn :), e.g. anatomy of version control, some language design, basics of interpreters & compilers.