[SOLVED] Convert long filename to short filename (8.3) using cmd.exe

Convert long filename to short filename (8.3) using cmd.exe

I am trying to convert a long filename to a short filename (8.3) on Windows.

A batch-file with a command line argument works as intended:

short.bat:

@echo OFF
echo %~s1

calling short.bat C:\Documents and Settings\User\NTUSER.DAT returns C:\DOCUM~1\USER\NTUSER.DAT

However, I don't like having an extra .bat-file for this. I would rather call cmd.exe with the whole command from a ruby script. How can I do this?

As an intermediate step I tried to hardcode the path in the batch-file, but that does not work:

short1.bat:

@echo OFF
SET filename="C:\Documents and Settings\User\NTUSER.DAT"
echo %filename%
echo %~sfilename%

echo %filename% works, but echo %~sfilename% gives the following error:

The following usage of the path operator in batch-parameter
substitution is invalid: %~sfilename%

For valid formats type CALL /? or FOR /?

If short1.bat works, how can I convert this into a one-liner that can be called with cmd.exe \c ...?

There is another question (how to get DOS path instead of Windows path), however that one is specifically asking for the path of the current directory.

Solution

cmd /c for %A in ("C:\Documents and Settings\User\NTUSER.DAT") do @echo %~sA