本书由上、下两篇组成。上篇为U N I X版本6的源代码，下篇是莱昂先生对U N I X操

作系统版本6源代码的详细分析。本书语言简洁、透彻，曾作为未公开出版物广泛流传了

二十多年，是一部杰出经典之作。本书适合U N I X操作系统编程人员、大专院校师生学

习参考使用。-This book by the upper and lower two components. The first part is the source code for UNIX version 6, Xiapian is Mr. Leon Version 6 UNIX operating system source code in detail. Book language simple, thorough, was not open as widely circulated publication for over two decades, is an outstanding classic. UNIX operating systems book for programmers, universities and students to learn reference.