RFC 3659:Extensions to FTP
RFC-Ref

user-FTP process


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... FTP commands", "DTP" (data transfer process), "user-FTP process", "user-PI" (user protocol interpreter), "user-DTP ...


... actually transmit the file, counting the transmitted octets. If the user-FTP process is intending to restart a retrieve, it will directly calculate the restart ...
... restart marker and send that information in the RESTart command. However, if the user-FTP process is intending to restart sending the file, it needs to be able to determine how ...


... of the listed directory. If the listed directory is the current directory, a CDUP command may also have the effect of changing to the named directory. User-FTP processes should note not all responses will include this information, and that some systems may provide multiple type=pdir responses. ...


... information to the user. It is not expected that users normally interact directly with the protocol elements, rather the user-FTP process constructs the commands, and interprets the results, in the manner best suited for the particular user. Explanatory text in responses generally has no particular meaning to the protocol. The ...



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