unix v7是最后一个广泛发布的研究型UNIX版本，之后的所有版本都是基于此。 v7的源码是最精美的，其认知价值甚至被认为超过了之前和之后的所有版本。-unix v7 is the last one to disseminate research-based UNIX versions, After all the versions are based on this. V7 the source is the most exquisite, and their cognitive val

整理 unix v7 的 ya- Reorganizes unix v7 ya

Unix的V6、V7源码，是学习内核的好例子。-Unix V6,V7 source code, good examples for studying kernel.