Design of the Unix Operating System https://archive.org/download/DesignOfTheUnixOperatingSystemByMauriceBach/Design%20of%20the%20Unix%20Operating%20System%20By

Design of the Unix Operating System https://archive.org/download/DesignOfTheUnixOperatingSystemByMauriceBach/Design%20of%20the%20Unix%20Operating%20System%20By%20Maurice%20Bach.pdf https://archive.org/download/DesignOfTheUnixOperatingSystemB... It is the high level bit for understanding Linux (and Unix). Good luck.