Perl FTP 相关module

Net::FTP::File - Perl extension for simplifying FTP file operations

http://cpan.uwinnipeg.ca/htdocs/Net-FTP-File/Net/FTP/File.html#ftp_gt_isfile

Net::xFTP - Common wrapper functions for use with either Net::FTP or Net::xFTP

http://cpan.uwinnipeg.ca/htdocs/Net-xFTP/Net/xFTP.html