bash中for循环求100内奇数和偶数的和

#/bin/bash

declare -i EVENSUM=0
declare -i ODDSUM=0

for I in {1..100}; do
    if [ $[$I%2] -eq 0 ]; then
        let EVENSUM+=$I
    else
        let ODDSUM+=$I
    fi
done

echo "odd sum is: $ODDSUM."
echo "event sum is: $EVENSUM."