"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
(Addison-Wesley Publishers, 1989, ISBN 0-201-06196-1); or
"The Design and Implementation of the 4.4 BSD Operating
System" by Marshall Kirk McKusick, Keith Bostic, Michael J. Karels
and John S. Quarterman (Addison-Wesley Longman, 1996, SBN
0-201-54979-4) Either of the standard reference books on the
internals of BSD Unix. So called because the covers have 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(2) system call).
Also known as the Devil Book.