# 第二部分 shell基础

## 目录

* [3. 特殊字符](/shell/part2/03_special_characters.md)
* [4. 变量与参数](/shell/part2/04_introduction_to_variables_and_parameters.md)
  * [4.1 变量替换](/shell/part2/04_introduction_to_variables_and_parameters/04_1_variable_substitution.md)
  * [4.2 变量赋值](/shell/part2/04_introduction_to_variables_and_parameters/04_2_variable_assignment.md)
  * [4.3 Bash弱类型变量](/shell/part2/04_introduction_to_variables_and_parameters/04_3_bash_variables_are_untyped.md)
  * [4.4 特殊变量类型](/shell/part2/04_introduction_to_variables_and_parameters/04_4_special_variable_types.md)
* [5. 引用](/shell/part2/05_quoting.md)
  * [5.1 引用变量](/shell/part2/05_quoting/05_1_quoting_variables.md)
  * [5.2 转义](/shell/part2/05_quoting/05_2_escaping.md)
* [6. 退出与退出状态](/shell/part2/06_exit_and_exit_status.md)
* [7. 测试](/shell/part2/07_tests.md)
  * [7.1 测试结构](/shell/part2/07_tests/07_1_test_constructs.md)
  * [7.2 文件测试操作](/shell/part2/07_tests/07_2_file_test_operators.md)
  * [7.3 其他比较操作](/shell/part2/07_tests/07_3_other_comparison_operators.md)
  * [7.4 嵌套 if/then 条件测试](/shell/part2/07_tests/07_4_nested_if_then_condition_tests.md)
  * [7.5 牛刀小试](/shell/part2/07_tests/07_5_testing_your_knowledge_of_tests.md)
* [8. 运算符和相关话题](/shell/part2/08_operations_and_related_topics.md)
  * [8.1 运算符](/shell/part2/08_operations_and_related_topics/08_1_operators.md)
  * 8.2 数字常量
  * 8.3 双圆括号结构
  * 8.4 运算符优先级


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