# 9. 换个角度看变量

## 本章目录

* [9.1 内部变量](/shell/part3/09_another_look_at_variables/09_1_internal_variables.md)
* [9.2 变量类型标注：`declare` 与 `typeset`](/shell/part3/09_another_look_at_variables/09_2_typing_variables_declare_or_typeset.md)
  * [9.2.1 `declare` 的另类用法](/shell/part3/09_another_look_at_variables/09_2_typing_variables_declare_or_typeset/09_2_1_another_use_for_declare.md)
* [9.3 `$RANDOM`：生成随机数](/shell/part3/09_another_look_at_variables/09_3_random_generate_random_integer.md)

在脚本中恰当的使用变量可以增强脚本并提高适应性。因此就需要了解变量的微妙之处和细微差异。


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