中国DOS联盟

In batch processing, when operating on a file passed in as an argument, if the file doesn't exist but the directory does, an error will occur during operation. So I want to make a judgment. My operation is to use if exist path\nul, but when there are long file names, it can't be judged. How should I do it? How to judge whether a parameter passed to the batch is a file name or a directory name?

关于wentimao的回复：

提问时请注明你的系统环境（DOS/98/XP）和脚本环境（COMMAND/CMD），如果将这些参数写在你的用户签名中，就无需每次都转发这些数据。

在CMD中判断文件或目录是否存在，一般不再使用NUl了。

判断是否存在目录：if exist "%~f1\" ...
判断是否存在文件：if exist "%~f1" if not exist "%~f1\"...

The reply to wentimao:

Please indicate your system environment (DOS/98/XP) and script environment (COMMAND/CMD) when asking a question. If you write these parameters in your user signature, you don't need to repost these data every time.

In CMD, to judge the existence of a file or directory, NUl is generally not used anymore.

To judge whether a directory exists: if exist "%~f1\" ...
To judge whether a file exists: if exist "%~f1" if not exist "%~f1\"...

Re wentimao:

Regarding the existence judgment issue of the same-named directory and file you mentioned in other topics, the reply is as follows:

1. In CMD and COMMAND, it is very rare to have the situation where the directory and file have the same name and path. This is not allowed by the file system rules of DOS/Windows; if it really occurs, it should be a problem of the system, and it should be solved by the system itself, not by our code to be compatible with this problem.

2. If you really want to judge "whether the file with the same name exists when the directory exists", you can use (but it is not recommended) the following code:

(for /f "usebackq" in ("%~f1") do ...)2>nul

I want to ask: How to know whether your script environment is COMMAND or CMD?

Under what system does it run? Is it run directly in cmd or in a batch file?

Originally posted by Hanyeguxing at 2010-12-4 16:28:
Under what system does it run?
Is it run directly in cmd or in a batch script?

Thank you very much for your reply,

I thought these posts were several years old. Hehe

Finally saw someone online:lol: Handshake...