This book introduces the mechanism of Linux operating system, analyzes some Linux kernel codes, and lists the targeted experiments of operating system; From the Linux operating system environment, system call, timer, kernel module, process scheduling, virtual storage, file system, step by step to change the Linux kernel. The use of Linux operating system environment is put in the appendix of this book. For readers who haven't studied Linux operating system commands, they need to master this knowledge.

On the other hand, the author himself is a programmer, and he has some experience of "creativity" in the process of programming. Readers are advised not to follow the rules when using this book. Readers can learn the Linux kernel with their own ideas, so that they can learn both the Linux source program itself and the "soul" of the program.