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- [1.4 FreeBSD 导论](https://book.bsdcn.org/di-1-zhang-freebsd-chu-jian/di-1.4-jie-freebsd-dao-lun.md)
- [1.1 什么是 UNIX？](https://book.bsdcn.org/di-1-zhang-freebsd-chu-jian/di-1.1-jie-shen-me-shi-unix.md)
- [1.3 Linux 与类 UNIX](https://book.bsdcn.org/di-1-zhang-freebsd-chu-jian/di-1.3-jie-linux-yu-lei-unix.md)
- [4.4 Shell 基础](https://book.bsdcn.org/di-4-zhang-freebsd-ji-chu/di-4.4-jie-shell-ji-chu.md)
- [4.6 文本编辑器](https://book.bsdcn.org/di-4-zhang-freebsd-ji-chu/di-4.6-jie-wen-ben-bian-ji-qi.md)

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