查看“Shell”的源代码

=== 简介 ===

==== 什么是 shell ====

==== 什么是 shell 脚本 ====

==== Shell 环境 ====

=== 基本语法 ===

==== 解释器 ====

==== 注释 ====

==== echo ====

==== printf ====

=== 变量 ===

==== 变量命名原则 ====

==== 声明变量 ====

==== 只读变量 ====

==== 删除变量 ====

==== 变量类型 ====

=== 字符串 ===

==== 单引号和双引号 ====

==== 拼接字符串 ====

==== 获取字符串长度 ====

==== 截取子字符串 ====

==== 查找子字符串 ====

=== 数组 ===

==== 创建数组 ====

==== 访问数组元素 ====

==== 访问数组长度 ====

==== 向数组中添加元素 ====

==== 从数组中删除元素 ====

=== 运算符 ===

==== 算术运算符 ====

==== 关系运算符 ====

==== 布尔运算符 ====

==== 逻辑运算符 ====

==== 字符串运算符 ====

==== 文件测试运算符 ====

=== 控制语句 ===

==== 条件语句 ====

==== if ====

==== if else ====

==== if elif else ====

==== case ====

=== 循环语句 ===

==== for循环 ====

==== while循环 ====

==== until循环 ====

==== select循环 ====

==== break和continue ====

=== 函数 ===

==== 位置参数 ====

==== 函数处理参数 ====