documented CURLOPT_FTP_USE_EPRT

A non-zero parameter tells the library to append to the remote file instead of

overwrite it. This is only useful when uploading to a ftp site.

.TP

.B CURLOPT_FTP_USE_EPRT

Pass a long. If the value is non-zero, it tells curl to use the EPRT (and

LPRT) command when doing active FTP downloads (which is enabled by

CURLOPT_FTPPORT). Using EPRT means that it will first attempt to use EPRT and

then LPRT before using PORT, but if you pass FALSE (zero) to this option, it

will not try using EPRT or LPRT, only plain PORT. (Added in 7.10.5)

.TP

.B CURLOPT_FTP_USE_EPSV

Pass a long. If the value is non-zero, it tells curl to use the EPSV command

when doing passive FTP downloads (which it always does by default). Using EPSV