How do I send raw ftp command?

many clients have a way to quote input commands and send them directly to the server.

For example, with the Windows command-line client (ftp.exe), log on to a remote host and try this:

ftp> quote cwd /pub
250 OK. Current directory is /pub
ftp> quote mode s
200 S OK

..and so on.

GUI clients typically have a similar function. FlashFXP has the Raw Command (CTRL-R) menu option for example.