目录结构
+---coding
|   +---python
|   \---shell
+---docker
|   +---其他
|   \---进阶
+---linux
|   +---aliyun
|   \---basics
|       +---文件与目录
|       +---文本处理
|       +---用户与群组
|       +---磁盘与文件系统
|       \---进程与服务
\---tools
    +---git
    +---jenkins
    \---pkgmg

tree

TREE [drive:][path] [/F] [/A]

   /F   Display the names of the files in each folder.
   /A   Use ASCII instead of extended characters.