The linux operating system is a free unix - like operating system that runs on the entire range of ibm hardware : xseries intel - based servers , pseries unix servers , iseries mid - range integrated servers , and zseries high - end mainframes Linux操作系统是一种免费的类unix操作系统，它可以在所有的ibm硬件上运行：基于intel的xseries服务器， pseries unix服务器， iseries中级集成服务器，以及zseries高端大型机。
The original intention of the pagoda project is to implement a simple and concise unix - like operating system which can be easily to understand , read and modify . it ' s network server is just a tcp / ip protocols stack implemented for a host 由于pagoda的设计初衷是实现一个结构简单清晰，便于理解的、便于阅读和修改源码的类unix操作系统，它的网络服务器也仅仅是一个简单的tcp ip协议栈在主机上的实现。
At the beginning , it analyses many problems caused before by the development of xscc software system without using software engineering . and then it explains the ways of software engineering used in dods in detail . finally it proposes a solution of controlling the version of code in u1nx 首先分析了在实施软件工程化以前西安中心软件系统的问题，然后具体介绍了软件工程化设计模式在数据汇集与分发系统中的实际应用，最后，提出了一种unix操作系统平台下的软件代码版本管理的方案。
