Syntax: append <clientfile> [to] [<serverfile>]
The APPEND command sends a file to the FTP server, appending it to the current server file. If the server file does not exist, this command creates it, and works exactly like the PUT command.
The following command appends a PC file to a server file of the same name:
This command appends a PC file to the specified server file:
APPEND WHATSNEW.DOC TO DOCUMENT.TXT