看完以后建议看看Rob Pike对Unix的总结

http://herpolhode.com/rob/ugly.pdf

The Good, the Bad, and the Ugly: The Unix! Legacy

high-level programming language
hierarchical file system
uniform, unformatted files (text)
separable shell
distinct tools
pipes
regular expressions
portability
security

虽然很短但是感觉超过了本书。