shell script to install and run

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http://askubuntu.com – I am trying to make an automatic installer which downloads file from ftp and installs it on system . Host = "zzz " USER= "ss" PASSWD = " xxXX" FILE = " *.tar" ftp $HOST << EOF user $USER passwd $PASSWD ---#to save in folder /tmp cd /tmp mget $(ls -t | head -1) --# to get last file EOF. Is this code is proper? And how will I know that the download has finished? Should I make any code changes for that? Because as soon as its finished downloading I have to install it using sudo dpkg. How to use this command in my existing code which I have written above? (HowTos)