Faciliate the work for lftp ('all' is needed if you wanna use it with getopts, otherwise its enough with the lftp line)
all="$(echo -e $*|awk '{for(i=3;i<=NF;++i)print $i}'|xargs)"; lftp -e open <HOSTNAME> -p <PORT> -u <USER>:<PASSWORD> -e "$all;exit"
Add this to a script and you can do ./scriptname site help or ./scriptname mput etc etc.
man ls