Their main role is to traverse the directory, according to the command line parameters can be achieved in document features such as copy files to view.
主要的功能是遍历目录，根据命令行参数可以实现文件拷贝文件查看等功能。
2
The main characters in the film are members of the public who traverse the square and line up in the cool refuge of the flagpole's narrow shadow.