http://www.nsftools.com/tips/RawFTP.htm
ABOR - abort a file transfer CWD - change working directory DELE - delete a remote file LIST - list remote files MDTM - return the modification time of a file MKD - make a remote directory NLST - name list of remote directory PASS - send password PASV - enter passive mode PORT - open a data port PWD - print working directory QUIT - terminate the connection RETR - retrieve a remote file RMD - remove a remote directory RNFR - rename from RNTO - rename to SITE - site-specific commands SIZE - return the size of a file STOR - store a file on the remote host TYPE - set transfer type USER - send username
