#!/bin/bash
read -p "qing shu ru yi ge shu zi 0-100o" GRADE
if [ $GRADE-ge 85 ] && [ $GRADE-le 100 ];
then
echo "85-100 wei you xiu "
elif [ $GRADE-ge 70 ] && [ $GRADE-le 84 ];
then
echo "70-84 wei zhong deng "
elif [ $GRADE-ge 1 ] && [ $GRADE-lt 70 ];
then
echo "$GRADExiao yu 70 dou shi i la ji"
else [ $GRADE-gt 100 ] && [ $GRADE-lt 1 ];
echo "error"
fi