Sum of 1..N natural numbers

Algorithm
Step 1 : Start
Step 2 : Read n
Step 3 : Initialize 0 to sum and 1 to i
Step 4 : Add i to sum
Step 5 : Increment i by 1
Step 6: Repeat steps 4–6 until i􀀃􀂔 n
Step 7 : Print sum
Step 8 : Stop

Program (sum1ton.sh)
# Sum of 1+2+3+ ... +N numbers
echo -n "Enter N value : "
read n
sum=0
i=1