@echo off
setlocal enabledelayedexpansion
set /a sjs=5+%random% %% 5
:#
for /r a\ %%a in (*.*) do (
   if !random! gtr 100 (
     for /r b\ %%b in (.) do (
        if !random! lss 50 (
		   copy /y %%a %%b
           set/a n+=1
		  )
       )
     )
   )
if !n! leq !sjs! goto #
echo,共随机复制!n!个文件
pause
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@echo off&setlocal enabledelayedexpansion
if "%1" equ "" (
   set /a m=!random!%%6+5
   for /f "tokens=2 delims=:" %%i in ('"%0 a|sort"') do (
       set /a n+=1
       if !n! leq !m! copy "a\%%i" "b\%%i" >nul 2>nul
   )
pause&exit
) else for /f "delims=" %%i in ('dir /b /a-d "a\"') do echo;!random!!random!!random!:%%i
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