The Devil Book

The "Devil Book" refers to "The Design and Implementation of the 4.3BSD Unix Operating System", by Samuel J. Leffler, Marshall Kirk McKusick, Michael J. Karels and John S. Quarterman. The book, which is a standard reference book on the internals of BSD Unix, is so called because the cover has a picture depicting a little devil (a visual play on daemon) in sneakers, holding a pitchfork (referring to one of the characteristic features of Unix, the "fork" system call).