The Art of UNIX Programming (Addison-Wesley Professional Computing Series)

Blurb

The Art of Unix Programming by Eric S. Raymond is a book about the history and culture of Unix programming from its earliest days in 1969 to 2003 when it was published, covering both genetic derivations such as BSD and conceptual ones such as Linux.
The author utilizes a comparative approach to explaining Unix by contrasting it to other operating systems including desktop-oriented ones such as Microsoft Windows and Mac OS to ones with research roots such as EROS and Plan 9 from Bell Labs. The book was published by Addison-Wesley, September 17, 2003, ISBN 0-13-142901-9 and is also available online, under a Creative Commons license with additional clauses.