Doug McIlroy 是认为UNIX的哲学是这样的：
1、Write programs that do one thing and do it well.
编写一些程序,做一件事,并且把它做好。
2、Write programs to work together.
编写程序一起工作。
3、Write programs to handle text streams, because that is a universal interface.
编写程序来处理文本流,因为这是一个通用的接口。
三条哲学，简明扼要，就是这三条哲学贯穿着整个Unix世界.