bat脚本判断文件是否存在

SET SourceFile=%cd%\updater.exe
SET GenFile1=%cd%\updater.exe
 
if exist %SourceFile% (
    if not exist %GenFile1% (
        copy %SourceFile% %GenFile1%
    ) else (
        echo %GenFile1% is not valid!
    )
) else (
    //你要做的事情
)