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 ====