默认情况下，这些文件按相同的目录结构存放。
By default, all these files are placed in the same directory structure.
这样做是很重要的，因为它影响着生成编录文件的方式和用于组件的默认目录。
Doing so is important, because it affects the way the catalog file is generated and the default directories used for the components.
定义变量用于设定当远程服务器不存在的时候我们需要设定的文件和目录的默认权限。
Define variables for the default file and directory permissions we will need to assign to files and directories which don't yet exist on the remote server.
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