if多条件分支判断学生的成绩

#! /bin/bash
read -p "请输入你的成绩 " cj
if [ $cj -ge 0 ] && [ $cj -le 59 ] ; then
    echo "负分滚出"
elif [ $cj -ge 60 ] && [ $cj -le 70 ] ; then
    echo "考的啥玩意，将吧及格"
elif [ $cj -ge 71 ] && [ $cj -le 90 ] ; then
    echo "哎呦不错哦"
[ $cj -ge 91 ] && [ $cj -le 100 ] ; then
    echo "老铁双击666"
else 
    echo "别在那撩欠"
fi