Dir \ B> log.txt failure in batch processing (the pre-symbol of the parameter must be/: Dir/B> log.txt)

Cause:

Batch Processing is used for batch directory processing. one of the following statements is:

Dir \ B> log.txt

There is no problem in using "cmd", but in batch processing, the following message is always prompted:

"File not found" or "the specified path is invalid" or

"The volume in drive Z is Data
The serial number of the volume is the CC21-7E88"

And so on.

Remove the file name and change it to Dir \ B.

But you can remove the parameter and change it to dir> log.txt.

In addition, the \ B parameter cannot be used before or after interchange with the output file segment.

Solution:

Prefix symbols of parameters are always inaccurate. Here "\" is used, and "-" cannot be replaced. After "/" is used, you can.

Conclusion:

CMD adds the redundancy function. It supports the "\", "-", and "/" symbols as parameter prefixes, but it is not so lucky in batch processing. Haha!