You can create a file called ".netrc" in your home directory. Put these line in .netrc file:

machine servername login username password passwordhere

When it's done, create a file (we will call it "ftpcommands")
that contains the commands. For example:

cd /ftp/directory
put yourfile
bye

and call it:
# ftp servername < ftpcommands

or

#!/bin/bash
#autoftp.sh
ftp machine < ftpcommand

# ./autoftp.sh

Note: chmod 400 .netrc

You can also use "expect". man expect for more info


HTH