find how many files in a folder (快速查看某个目录下有多少文件）
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有个项目会写静态文件，结果发现一次就要写22W个文件。。。。 用LS根本无法实现，所以。。。 ( if there are a huge number of files in a folder , you can't use 'ls' to find files, instead, we should use : find. )
sg552@youku:/sg552/workspace/test_nginx/static_files_popup_page$ find . -type f | wc -l 220164 sg552@youku:/sg552/workspace/test_nginx/static_files_popup_page$ du . -h 906M .