Thanks for your responses on the best choice of an FTP application to
use from FileMaker. I considered an FTP plugin, but that was never
updated to long filenames. "Fetch" is a reasonable solution but it's
not everyone's preferred ftp client, and it would require people to
purchase the shareware product. Unix rsyncd/sshd would be a good
solution except that it places a requirement on the server to support
it (and I believe my ISP uses Windows servers so I'm guessing that's
not the case). So I guess I'm back to curl.
The problem with curl is that it doesn't provide a directory listing
in a consistent format (not one that contains the file dates) which
makes parsing out the current date of files difficult. The FTP plugin
I was using did this, and so does Fetch.