How to login to ftp in one step?

From the example that you mentioned, be sure to use the -n flag to disable auto-login

C:\adc_ftp>ftp -n -s:ftp_script.txt localhost

Where ftp_script.txt contains something like:

user
ftp
ftppassword
Some ftp commands...
quit 

To do this, you need to make a text file.

For instance, to get a file that is located at ftp://ftp.kernel.org/pub/README this is my text file:

open ftp.kernel.org
anonymous
[email protected]
get /pub/README
bye

I then call ftp using the -s parameter, like:

C:\Documents and Settings\eleven81\Desktop>ftp -s:ftp.txt

Which worked perfectly for me.