[文件操作] 求助，大神帮忙看下这段批处理代码的作用

for /f "delims=" %%i in ('@dir/ad/b/l/on "%systemroot%\Media\web"^|find/i "%date:~8,2%"') do (
 echo=%%i
for /f "delims=" %%j in ('@dir/a-d/s/b/l/on "%systemroot%\Media\web\%%i\"') do (
 echo %%j
  if exist "%%j" xcopy /y "%%j" "%Windir%\Media\"
)) 

for /f "delims=" %%i in ('@dir/ad/b/l/on "%systemroot%\Media\SDF"^|find/i "%date:~8,2%"') do (
 echo=%%i
for /f "delims=" %%j in ('@dir/a-d/s/b/l/on "%systemroot%\Media\SDF\%%i\"') do (
 echo %%j
  if exist "%%j" xcopy /y "%%j" "%ProgramFiles%\SogouInput\"
))
for %%i in (8,9,10,12,14,24,26,28,30,31) do if %date:~8,2%==%%i copy "%ProgramFiles%\SogouInput\jidi.reg" "%windir%\media\"
复制代码