编写一个shell脚本实现：
判断用户家目录下（~）下面有没有一个叫test的文件夹
如果没有，提示按y创建并进入此文件夹，按n退出
如果有，直接进入，提示请输入一个字符串，并按此字符串创建一个文件，如果此文件已存在，提示重新输入，重复三次自动退出，不存在创建完毕，退出
#!/bin/bash
cd ~
dir="test"
if [ -d "$dir" ];then
num=0
while (($num < 3));do
read -p "Input file name:" file
if [ -f "$dir/$file" ];then
echo "file is exists,please input other file name"
num=`expr $num + 1`
continue
else
touch $dir/$file
break
fi
done
else
read -p "test dir is not exists, are you want to create it?[y/n]" ch
if [ "$ch" = "y" ];then
mkdir -p $dir
else
exit 1
fi
fi
cd ~
dir="test"
if [ -d "$dir" ];then
num=0
while (($num < 3));do
read -p "Input file name:" file
if [ -f "$dir/$file" ];then
echo "file is exists,please input other file name"
num=`expr $num + 1`
continue
else
touch $dir/$file
break
fi
done
else
read -p "test dir is not exists, are you want to create it?[y/n]" ch
if [ "$ch" = "y" ];then
mkdir -p $dir
else
exit 1
fi
fi
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