判断输入的是yes还是no

if写法

#!/bin/bash
read -p "please input yes or no: " YON
if [[ "$YON" =~ ^[Yy][Ee][Ss]$ ]];then
    echo "What you type in is: yes"
elif [[ "$YON" =~ ^[Nn][Oo]$ ]];then
    echo "What you type in is: no"
else
    echo "What you type in is: other"
fi