if語句練習之測值

#!/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