Shell Programming and Scripting

#WRITTEN BY MVONA; FREE TO USE AND ABUSE
#THE WORK "WORKS FOR ME" TM
#THIS SCRIPT CONNECTS TO FTP SERVERS AND DOWNLOADS STUFF
#YOU NEED FOUR COLUMN SPACE SEPARATED FILE CONTAINING IN THE FOLLOWING 
#FORMAT:
#<FTP SERVER ADDRESS> <FULL PATH AND FILE NAME OF THE FILE YOU WANT><LOGIN><PASSWORD>
#
#THIS SCRIPT NEEDS TO BE CALLED BY PASSING THE FULL PATH TO THE ABOVE FILE AS ITS FIRST PARAMETER.
##########################################################
#      ERROR HANDLING                                    #
##########################################################
usage()
    {
    
        echo "Proper usage: $0 <full path to server list>"
        exit 1
    }


if [ $# -ne 1 ]; then
    {
        usage
    }
    elif  [ ! -f $1 ]; then
    {
        echo "I see no file $1"
        usage
    }
    elif [ `awk '{print NF; exit}' $1` -ne 4  ]; then
    {
    echo "I see the file $1, but I don't see 4 columns of data in it..."
        usage
        
    }
fi
##############################################################
#        MAIN ROUTINE                                                         #
##############################################################

cat $1 | grep -v '^#' | (while read server file user pass
do
    echo -e "user $user $pass\n binary\n passive\n get $file\n bye" | ftp -niv $server
done)

#POUND COMMENTS THE LINE
#FORMAT: SERVER FILE USER PASS
ftp.yoursite.com /pub/docs username password

while read -r server file user pass
do
        ftp -niv $server <<EOF
user $user $pass
binary
passive
get $file
bye
EOF
done < $1