什么是我们大量repitition ./foo和cd背后的故事…这两个。和..来自？它们在哪里可以被看作是第一次导航文件系统树的方式？
摘录自
interview with Ken Thompson(9-6-89)：
Every time we made a directory,by
convention we put it in another
directory called directory –
directory,which was dd. Its name was
dd and that all the users directories
and in fact most other directories,
users maintain their own directory
systems,had pointers back to dd,and dd got shortened into ‘dot-dot,’ and dd was for directory-directory.
