How to change a FTP password from Command Line?

Question

I'm using putty to connect ftp server, available commands are listed above ; Which one is for changing ftp password. Please help

ftp> help
Commands may be abbreviated.  Commands are:

!               cr              mdir            proxy           send
$               delete          mget            sendport        site
account         debug           mkdir           put             size
append          dir             mls             pwd             status
ascii           disconnect      mode            quit            struct
bell            form            modtime         quote           system
binary          get             mput            recv            sunique
bye             glob            newer           reget           tenex
case            hash            nmap            rstatus         trace
ccc             help            nlist           rhelp           type
cd              idle            ntrans          rename          user
cdup            image           open            reset           umask
chmod           lcd             passive         restart         verbose
clear           ls              private         rmdir           ?
close           macdef          prompt          runique
cprotect        mdelete         protect         safe
ftp>

Answer 1

You have to change the password on the server itself. Typically in UNIX this will be the system user account. Once you had a shell session established, you would run the passwd command.

Answer 2

Some ftpd do allow users to change their password with the 'site' command:

glftpd:

site passwd <string>
    Change password for the logged in user.
    See "site chpass" for info and restrictions.

drftpd:

site passwd <password>

Answer 3

IIRC none of them are. You don't change password from within the ftp session.