Tickets: Other FTP Support Commands: Qianqian Support Command You can use the help command to get the list of commands supported by your FTP program, as shown in Figure 6.
Figure 6 Help Command FTP> HELP
Commands May Be Abbreviated. Commands Are:
DELETE LITERAL PROMPT Send
DEBUG LS PUT STATUS
Append Dir Mdelete PWD TRACE
ASCII Disconnect Mdir Quit Type
Bell Get Mget Quote User
Binary Glob Mkdir Recv Verbose
Bye Hash MLS Remotehelp
CD Help MPUT RENAME
Close LCD Open RMDir
FTP>
End Session In the FTP prompt, enter BYE to end the session. FTP> BYE
Others explain that you have commands you entered to the FTP program and the FTP actual transfer to the FTP server. For example, when you enter a Dir command, the FTP program is actually transmitted to the FTP server is the list command. The ftp protocol will be referred to as mentioned below, unless otherwise stated. In FTP, port 21 (control connection) will be used to transfer commands; and another port is used to transmit data, the default is port 20. However, you can also use other ports, which makes programming a bit complicated. Connecting the FTP server receives the initial connection at the 21st port and keeps the open state, this connection will be used to process the FTP command; this is different from HTTP, HTTP is a connection protocol, each time you reconstruct the connection. Another independent connection is used to transmit data. These two connects are called control connectivity and data connection, for example, when to download a file, the client usually sends a port command, accepts the connection at the 20 port, then use the retr command to tell the server to send file. The server sends data and then close the connection. Another client available command is PSAV (represent passive mode), and the client tells the server to listen for a specific port. Then connect to that port for data connection. The author prefer to use passive mode because you don't have to accept one connection. If you want to use the port command, it is best to open the No. 20 port or the available port of 1024, and then send a port command to the server. 1-1024 The port is reserved inside the TCP. The FTP command FTP uses a series of simple commands such as LIST or RETR to complete different tasks. Each FTP command ends with CR / LF (Enter). (Thousands of VB stations are reproduced, please keep this information)
This is a work I have translated more years ago, please indicate anything wrong. . . . Qianqian (Thousandvb@yeah.net)
