#!/bin/bash
flag=1

# -e 检测存在性
if [ -e ~/qfedu-linux-advanced-level/day1/test2 ]; then
    echo "the test dir is exist"
else
    echo "the test dir is not exist"
    
    # 等同于 while[ $flag ]
    # do 用于开始 while 循环
    while [ $flag -eq 1 ]
    do
        echo "press y to create the dir,press n to exit"
        read yn
        case $yn in
            y)
                echo "mkdir ~/qfedu-linux-advanced-level/day1/test2"    
                mkdir ~/qfedu-linux-advanced-level/day1/test2
                # flag = 0 用于结束 while 循环
                flag = 0
                # ;; 用于结束 case 语句，相当于 break
                ;;
            n)
                echo "end operation"
                # exit -1 用于退出脚本，-1 为错误码
                exit -1
                ;;
            *)
                echo "your input is error exit"
                echo "please input again"
                flag=1
                ;;
        # esac 用于结束 case 语句
        esac
    # done 用于结束 while 循环
    done
# fi 用于结束 if 语句
fi

cd ~/qfedu-linux-advanced-level/day1/test2

for((i=1 ; i<4 ; i++))
do
    echo "please input a string, we will create it as a dir"
    read dir_name
    if [ -e $dir_name ]; then
        echo "$i please input other name"
    else
        echo "the $dir_name is created"
        mkdir $dir_name
        break
    fi
done

echo "your times is over"
if [ $i -eq 3 ]; then
    echo "your times is over"
    exit 0
fi