echo a|xcopy d:\a c:\b /d
复制代码

@echo off
Xcopy /y /e /d "D:\test\*.*" "C:\test\"
for /r C:\test\ %%i in (*) do set wind=%%~z1 (
for /r D:\test\ %%a in (*) do set snow=%%~z1 (
if "%%~ni"=="%%~na" (
if %wind% gtr %snow% (Xcopy "%%~na" "C:\test\")
if %wind% lss %snow% (echo please process the "%%~ni")
)
))
exit
复制代码

@echo off

set "SrcDir=D:\A"
set "DestDir=C:\B"

for %%S in ("%SrcDir%\*") do (
    if not exist "%DestDir%\%%~nxS" (
        copy "%%S" "%DestDir%"
    ) else (
        for %%D in ("%DestDir%\%%~nxS") do (
            if %%~zS gtr %%~zD (
                copy "%%~D" "%%~D.bak"
                copy "%%S" "%DestDir%"
            ) else (
                if %%~zS lss %%~zD echo 请手动处理“%%~nxS” >con
            )
        )
    )
) >nul

echo 完成！请按任意键退出...
pause >nul
复制代码

@echo off
path "C:\B"
(for /f "delims==" %%i in ('dir /b /a-d D:\A') do (
	if %%~z$PATH:i gtr %%~zi copy /y "D:\A\%%i" "C:\B\" else (
		if %%~z$PATH:i lss %%~zi echo>con 目标文件夹存在同样大小的"%%~nxi"
	)
))>nul
pause
复制代码