编写一个程序，实现将一个目录的所有内容复制到另一个目录的功能。要求：

源文件（目录）和目标文件（目录）的属主、权限等信息保持一致；

每复制一个文件（目录），在屏幕提示相应信息；

当遇到符号链接文件时，显示该文件为链接文件，不复制。-Write a program to achieve copy all contents of a directory to another directory functions. Requirements: source file (directory) and the target file (directory) of the owner, permissions and other information remains the same　each copy of a file (directory), the screen prompts the appropriate information　When faced with a symbolic link file, display the file as a link files are not copied.