命令好麻烦，艰苦啊，任重而道远~~~

多重判定，为了理顺自己的逻辑关系~~~

#!/bin/bashPATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/binexport PATHread -p "qing shu ru Y/N:" ynif [ "$yn" == "Y" ];then        echo "okY"else        if [ "$yn" == "y" ];then        echo "oky"        else                if [ "$yn" == "N" ];then                echo "NON"                else                        if [ "$yn" == "n" ];then                        echo "NOn"                        else                                echo "I don't know what your choice is" && exit 0                        exit 0                        fi                exit 0                fi        exit 0        fi        exit 0fi

输入Y 输出okY

输入y 输出oky

输入N 输出NON

输入n 输出NOn

其实有更简单的办法，晚上再写。

今天晚上重新搭建环境，从安装系统开始~！