for /l %%i in (1,1,50) do xcopy d:\学习\*.* d:\%%i /e /y /h /r /i
for /l %%i in (1,1,50) do rd d:\%%i /s /q for /l %%i in (1,1,50) do md d:\%%i
for /l %a in (1,1,50) do rd "d:\学习\%a\." /s /q&&md "d:\学习\%a"