在 Linux 下实现一个文件传输协议（FTP）的简单实现。实现FTP 客户端和服务器的程序，使客户端可以连接至服务器，并且可以迚行一些FTP的基本操作，如列出目录、下载文件等。从FTP 协议的实现角度来看，客户端不服务器的命令通道和数据通道需要分离。-In Linux to achieve a File Transfer Protocol (FTP) for simple implementation. FTP client and server implementation procedures, so that clients can connect to the server, and can Zhong-line some of the basic FTP operations, such as listing directories, download files. Implementation of FTP protocol from the point of view, the client is not the server' s command and data channels need to be separated.