There's many CLI (command line) clients out there. Most common is simply
ftp. You've got
<pass> and "passive mode". Using
ftp you should do:
ftp -p <host> <port>
-p switch means "use passive mode". Then you'll be asked about your username and password. After successful login (server let you know about that), you are able to give some commands. Type
help and press "enter" to get list of commands available. You can use e.g.
mkdir ftp commands to change working directory (on the server), list its contents and create a new directory. If before running
ftp you were in the same directory as you files you want to send, you can use
mput command to start actual transfer. First command sends one file, second multiple files using globbing (e.g.
mput *pdf will send all pdf files in current directory). To get simple help about command you can use
help <command> from within
ftp app. I'd say that's enough for starters. For the rest use
man ftp or
info ftp. To end ftp session type
bye. There are other ways to do that but I think this one is just elegant :).
As for the other clients, some interesting choices were pointed here, but I personally use
lftp. It's just solid, good, flexible and easy to use ftp client. If you prefer more visual approach while still being under command line, you can go for
mc or "Midnight Command". It's general application file manager utilizing Norton Commander paradigm, but can be also used to access ftp servers.