生成目录结构树 tree

      我们在工作中经常会用到目录结构，比如在向客户提交产品资料的时候，需要一份清单来说明提交了哪些资料，资料多的时候往往需要一个一个来整理，下面介绍一种快速的方法；

一、mac系统

　　1、推荐 brew 安装 tree

　　　　brew install tree

xyz$ brew install tree
Warning: You are using OS X 10.12.
We do not provide support for this pre-release version.
You may encounter build failures or other breakages.
Please create pull-requests instead of filing issues.
==> Downloading http://mama.indstate.edu/users/ice/tree/src/tree-1.7.0.tgz
######################################################################## 100.0%
==> make prefix=/usr/local/Cellar/tree/1.7.0 MANDIR=/usr/local/Cellar/tree/1.7.0/share/man/ma
????  /usr/local/Cellar/tree/1.7.0: 7 files, 113.2K, built in 8 seconds

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