把下面的批处理存为文件，放在A1和A2的同层文件夹下，双击运行即可。
@if not exist A2\. (
md A2
copy A1\aa.txt A2
copy A1\bb.txt A2
copy A1\cc.txt A2
)
@if exist A2\bb.txt (
@echo. >>A2\bb.txt
@echo %date%-%time% >>A2\bb.txt
@echo. >>A2\bb.txt
@type A1\bb.txt >> A2\bb.txt
)
@if exist A2\cc.txt (
@echo.>>A2\cc.txt
@echo %date%-%time% >>A2\cc.txt
@echo.>>A2\cc.txt
@type A1\cc.txt >> A2\cc.txt
)
@delete /y A1\bb.txt
@delete /y A1\cc.txt
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