如何从批处理文件中检查文件是否存在

问题描述：

仅当某个文件存在时，我才需要运行实用程序.如何在 Windows 批处理中执行此操作?

I need to run a utility only if a certain file exists. How do I do this in Windows batch?

答

if exist <insert file name here> (
    rem file exists
) else (
    rem file doesn't exist
)

或者在一行上(如果只需要执行一个操作):

Or on a single line (if only a single action needs to occur):

if exist <insert file name here> <action>

例如，如果文件存在，这将在 autoexec.bat 上打开记事本:

for example, this opens notepad on autoexec.bat, if the file exists:

if exist c:autoexec.bat notepad c:autoexec.bat