<P> Simple File Transfer Protocol (the first protocol abbreviated SFTP), as defined by RFC 913, was proposed as an (unsecured) file transfer protocol with a level of complexity intermediate between TFTP and FTP . It was never widely accepted on the Internet, and is now assigned Historic status by the IETF . It runs through port 115, and often receives the initialism of SFTP . It has a command set of 11 commands and support three types of data transmission: ASCII, binary and continuous . For systems with a word size that is a multiple of 8 bits, the implementation of binary and continuous is the same . The protocol also supports login with user ID and password, hierarchical folders and file management (including rename, delete, upload, download, download with overwrite, and download with append). </P> <P> Below is a summary of FTP reply codes that may be returned by an FTP server . These codes have been standardized in RFC 959 by the IETF . The reply code is a three - digit value . The first digit is used to indicate one of three possible outcomes--success, failure, or to indicate an error or incomplete reply: </P> <Ul> <Li> 2yz--Success reply </Li> <Li> 4yz or 5yz--Failure reply </Li> <Li> 1yz or 3yz--Error or Incomplete reply </Li> </Ul> <Li> 2yz--Success reply </Li>

What is the use of ftp server in linux