FTP程序(客户端)允许你在远程主机上为文件及目录设定权限。
FTP programs (" clients ") allow you to set permissions for files and directories on your remote host.
因为属性页面可被显示为很多选中的文件及目录，所以必须预先计算多个文件。
Because the property page can be displayed for a number of selected files and directories, you have to make provisions for counting multiple files.
设想一个场景，您想要递归地访问一个目录树，在该树中的每个文件及目录上停下来，并为每个查找到的条目调用您自己的回调方法。
Imagine a scenario in which you want to traverse a directory tree recursively, stopping at each file and directory under that tree and having your own callback methods invoked for each entry found.
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