FTP command and use

FTP command If you want to write an FTP client program, you must first understand the commands and usage in the FTP protocol. FTP commands The following are the FTP commands: User <SP> <username> <CRLF> logon Username Pass <SP> <password> <CRLF> Password Acct <SP> <account-Information> <CRLF> CWD <SP> <pathname> <CRLF> change the current directory Cdup <CRLF> returns the parent directory SMNT <SP> <pathname> <CRLF> Quit <CRLF> quit Rein <CRLF> log on again Port <SP> PASV <CRLF> obtains the data transmission Port Type <SP> <type-code> <CRLF> set the data exchange type {A (scii), E (bcdic), I (mage), L (ocal byte size )} Stru <SP> <structure-code> <CRLF> Mode <SP> <mode-code> <CRLF> RETR <SP> <pathname> <CRLF> Stor <SP> <pathname> <CRLF> upload a file to the server in overwrite Mode STOU <CRLF> Appe <SP> <pathname> <CRLF> append an object to the server Allo <SP> <Decimal-integer> [<SP> r <SP> <Decimal-integer>] <CRLF> Rest <SP> <marker> <CRLF> specifies the number of bytes that are stored again. RNFR <SP> <pathname> <CRLF> specifies the original file to be renamed RNTO <SP> <pathname> <CRLF> specifies the new file name to be renamed. Abor <CRLF> cancels the previous command Dele <SP> <pathname> <CRLF> delete a specified file on the server RMD <SP> <pathname> <CRLF> Delete the specified directory on the server MKD <SP> <pathname> <CRLF> create a directory on the server PWD <CRLF> displays the current directory List [<SP> <pathname>] <CRLF> list all files and subdirectories in the current directory NLST [<SP> <pathname>] <CRLF> lists the names of all files and subdirectories in the current directory. Site <SP> <string> <CRLF> Syst <CRLF> Stat [<SP> <pathname>] <CRLF> Help [<SP> <string>] <CRLF> get help Noop <CRLF> FTP security commands and arguments Auth <SP> <mechanic-Name> <CRLF> Adat <SP> <base64data> <CRLF> Prot <SP> <prot-code> <CRLF> Pbsz <SP> <Decimal-integer> <CRLF> MIC <SP> <base64data> <CRLF> Conf <SP> <base64data> <CRLF> ENC <SP> <base64data> <CRLF> <Mechanic-name >::=< string> <Base64data >::= <string> ; Must be formatted as described in section 9 <Prot-code >::= c | S | E | P <Decimal-integer>: = any decimal integer from 1 to (2 ^ 32)-1   The above are some commands supported by the FTP protocol. The following describes some examples. FTP commands

The following is an example of a successful Serv-U test using telnet. Download files --------------------------------------------------------------------------- Telnet 127.0.0.1 21 220 Serv-u ftp server v4.0 for Winsock ready... User admin 331 user name Okay, need password. Pass **** 230 user logged in, proceed. PASV 227 entering passive mode <127,0, 4,191,> Rest 0 350 restarting at 0. Send store or retrieve. RETR test.rar 150 opening ASCII mode data connection for test.rar <94370 bytes>. 226 transfer complete.   Upload files in overwriting Mode --------------------------------------------------------------------------- Telnet 127.0.0.1 21 220 Serv-u ftp server v4.0 for Winsock ready... User admin 331 user name Okay, need password. Pass **** 230 user logged in, proceed. Stor test. dat 150 opening ASCII mode data connection for test. dat PASV 227 entering passive mode <127,0, 4,191,> ... Create another connection to the specified port and send data to it...   Upload files by append --------------------------------------------------------------------------- Telnet 127.0.0.1 21 220 Serv-u ftp server v4.0 for Winsock ready... User admin 331 user name Okay, need password. Pass **** 230 user logged in, proceed. Appe test. dat 150 opening ASCII mode data connection for test. dat PASV 227 entering passive mode <127,0, 4,191,> ... Create another connection to the specified port and send data to it...   Rename files and directories --------------------------------------------------------------------------- Telnet 127.0.0.1 21 220 Serv-u ftp server v4.0 for Winsock ready... User admin 331 user name Okay, need password. Pass **** 230 user logged in, proceed. RNFR sss.rar 350 file or directory exists; ready for destination name RNTO stock.rar 250 RNTO command successfull.   Delete an object --------------------------------------------------------------------------- Telnet 127.0.0.1 21 220 Serv-u ftp server v4.0 for Winsock ready... User admin 331 user name Okay, need password. Pass **** 230 user logged in, proceed. Dele test. dat 250 DELE Command successfull.   Create and delete directories --------------------------------------------------------------------------- Telnet 127.0.0.1 21 220 Serv-u ftp server v4.0 for Winsock ready... User admin 331 user name Okay, need password. Pass **** 230 user logged in, proceed. MKD mydir 257 "/mydir" directory created. RMD mydir 250 RMD Command successfull.   Disconnect --------------------------------------------------------------------------- Telnet 127.0.0.1 21 220 Serv-u ftp server v4.0 for Winsock ready... User admin 331 user name Okay, need password. Pass **** 230 user logged in, proceed. Quit 221 goodbye!