今天看到一个Hard Drive Killer Pro Version 4.0的批处理
他里面有这么一句话

if not exist %%1:%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2%%2nul goto star* 

各位那个%%1后面那个 : 冒号有什么用
还有为什么在后面加那么多%%2
什么情况下有必要加这么多%%2

　　这段代码从哪里看到的啊？印象中，willsort版主对它有过深入的分析，只是一下子搜索不到那篇文章了。