MacOSX的tree命令

Linux和Windows下的tree命令对于需要查看一个目录的文件树非常有用，但是MacOS X中居然没有（Windows中都有，居然MacOS X中没有，这怎么能忍），找到一条shell命令可以实现这个功能需求：

find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'

效果如下：

➜  ScrapyProject git:(master) ✗ find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'.|____.DS_Store|____.git| |____branches| |____config| |____description| |____HEAD| |____hooks| | |____applypatch-msg.sample| | |____commit-msg.sample| | |____post-update.sample| | |____pre-applypatch.sample| | |____pre-commit.sample| | |____pre-push.sample| | |____pre-rebase.sample| | |____pre-receive.sample| | |____prepare-commit-msg.sample| | |____update.sample| |____info| | |____exclude| |____objects| | |____info| | |____pack| |____refs| | |____heads| | |____tags|____scrapy.cfg|____ScrapyProject| |______init__.py| |______init__.pyc| |____items.py| |____middlewares.py| |____pipelines.py| |____settings.py| |____settings.pyc| |____spiders| | |______init__.py| | |______init__.pyc| | |____DmozSpider.py

每次这样使用也不方便，当然就想到了使用alias给命令设置别名：

alias tree="find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'"

值得注意的是，需要在系统的.bashrc文件中添加该命令，这样才是全局有效并且永久生效（因为我用的是zsh，则在.zshrc文件中添加该命令）。
现在即可使用tree命令查看当前目录下的文件树结构了：

➜  ScrapyProject git:(master) ✗ tree.|____.DS_Store|____.git| |____branches| |____config| |____description| |____HEAD| |____hooks| | |____applypatch-msg.sample| | |____commit-msg.sample| | |____post-update.sample| | |____pre-applypatch.sample| | |____pre-commit.sample| | |____pre-push.sample| | |____pre-rebase.sample| | |____pre-receive.sample| | |____prepare-commit-msg.sample| | |____update.sample| |____info| | |____exclude| |____objects| | |____info| | |____pack| |____refs| | |____heads| | |____tags|____scrapy.cfg|____ScrapyProject| |______init__.py| |______init__.pyc| |____items.py| |____middlewares.py| |____pipelines.py| |____settings.py| |____settings.pyc| |____spiders| | |______init__.py| | |______init__.pyc| | |____DmozSpider.py