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Download File - Ram Chavan
Transcript
ascii Switches to ASCII transfer mode binary Switches to binary transfer mode cd Changes directory on the server close Terminates the connection del Deletes a file on the server dir Displays the server directory get Fetches a file from the server hash Displays a pound character for each block transmitted help Displays help lcd Changes directory on the client mget Fetches several files from the server mput Sends several files to the server open Connects to a server put Sends a file to the server pwd Displays the current server directory quote Supplies an FTP command directly quit Terminates the FTP session For most versions, FTP commands are case-sensitive. If you type commands in uppercase, FTP will display error messages. Some versions perform a translation for you, so it doesn't matter which case you use. Because Linux uses lowercase as its primary character set for everything else, you should probably use lowercase with all versions of FTP, too. How FTP Uses TCP The File Transfer Protocol uses two TCP channels: TCP port 20 is used for data, and port 21 is for commands. Both these channels must be enabled on your Linux system for FTP to function. The use of two channels makes FTP different from most other file transfer programs. By using two channels, TCP allows simultaneous transfer of FTP commands and data. FTP works in the foreground and does not use spoolers or queues. FTP uses a server daemon that runs continuously and a separate program that is executed on the client. On Linux systems, the server daemon is called ftpd. The client program is ftp.
