Some years ago someone told me this: "if you are a C Programmer and work on GNU/Linux (Lignux ?) and you have system programming as your hobby, intend on work on OS side then you need to master these three things: 1) ANSI C (and/or C++) 2) your compiler (gcc) 3) I forgot I work on GNU/Linux most of the time as hobby and I I fit the description above and have turned the system programming hobby of mine into a job. Hence I intend to understand GNU C compiler (gcc) and for that can you guys tell me if these 2 books are required: http://shop.fsf.org/product/gnu-c-library-application-fundamentals/ http://shop.fsf.org/product/gnu-c-library-system-network-applications/ or reading them will not make much difference ? -- http://uttre.wordpress.com/2008/05/14/the-lost-love-of-mine/