[文件操作] 批处理如何保留每个文件夹中扩展名为brd的最初和最后保存的两个文件？

@echo off
for /f "delims=" %%i in ('dir /b /ad') do (
    pushd "%%i"
    setlocal enabledelayedexpansion
    for /f "delims=" %%j in ('dir /b /od /a-d *.brd') do (
        if not defined str set "_%%j=true"
        set "str=%%j"
    )
    set "_!str!=true"
    set str=
    for /f "delims=" %%j in ('dir /b /a-d *.brd') do if not defined _%%j del "%%j"
    endlocal
    popd
)
pause
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@echo off &setlocal enabledelayedexpansion
(dir /b/s/ad &echo,%cd%)>all.d
for /f "delims=" %%d in (all.d) do if exist "%%d\*.brd" (
   set "lastF=" & for /f "skip=1 delims=" %%F in ('dir /b/a-d/od/tw "%%d\*.brd" ') do (
      if not defined lastF (set "lastF=%%d\%%F") else (del/q "!lastF!"&set "lastF=%%d\%%F")
   )
)
del/q "all.d"&endlocal&pause&exit/b
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@echo off
for /f "delims=" %%i in ('dir /b /s /ad') do (
    pushd "%%i"
    if exist *.brd (
        setlocal enabledelayedexpansion
        for /f "delims=" %%j in ('dir /b /od /a-d *.brd') do (
            if defined str (
                if defined n del "!str!"
                set n=0
            )
            set "str=%%j"
        )
        endlocal
    )
    popd
)
pause
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