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系统目录结构、ls命令、文件类型、alias命令-qq5a6d861adfe89的博客-51CTO博客
source link: http://blog.51cto.com/13589255/2067073
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命令:.tree 查看一个目录下的子目录 !tree 查找history中最后以tree开头的命令 man +一个命令 :可以看到这个命令下的选项和其含义  
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