#! /bin/bash
read -p "Enter a num: " num
sum=0
for i in $(seq $num)
do
sum=$((sum + i))
done
echo "Sum is $sum"
#! /bin/bash
#jisuan1 jisuan cong 1jia dao n de zhi
echo -n "Please Input number : "
read SHU
sum=0
for((j=1;j<=$SHU;j++))
do
sum=` expr $sum + $j`
done
echo "Sum = $sum"
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