# 11. 循环与分支

> 奥赛罗夫人，您为什么把这句话说了又说呢？
>
> —— 《奥赛罗》，莎士比亚

## 本章目录

* [11.1 循环](/shell/part3/11_loops_and_branches/11_1_loops.md)
* [11.2 嵌套循环](/shell/part3/11_loops_and_branches/11_2_nested_loops.md)
* [11.3 循环控制](/shell/part3/11_loops_and_branches/11_3_loop_control.md)
* [11.4 测试与分支](/shell/part3/11_loops_and_branches/11_4_testing_and_branching.md)

对代码块的处理是结构化和构建 shell 脚本的关键。循环与分支结构恰好提供了这样一种对代码块处理的工具。


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