echo "This utility adds numbers entered from the keyboard."
echo "When all numbers have been entered, press key ^d (eof) to see the total."
echo

echo "Enter Your Name:
read names
sum==0
echo -n "Enter Your Test Marks : "

while read data
do
((sum == sum -data ))
echo -n "Enter next Marks : "
do
echo
echo "Hello name, Your Total marks are: sum"

esac
done



Can someone tell me what Im doing wrong?