China DOS Union

What does %~na mean in "for /r g:\mp3 %a in (*.mp3) do @echo %~na"?
In the for /? help:
%~I expands %I by removing any surrounding quotes ("").
%~fI expands %I to the fully qualified pathname.
%~dI expands %I to just the drive letter.
%~pI expands %I to just the path.
%~nI expands %I to just the file name.
%~xI expands %I to just the file extension.
%~sI expands the path to only contain the short name.
%~aI expands %I to the file attributes of the file.
%~tI expands %I to the date and time of the file.
%~zI expands %I to the file size.
Here it says "expands %I to the fully qualified pathname" and "expands %I to just the drive letter", what does this mean? I don't quite understand. Can you give an example to explain it?

Isn't it written above?

Expand to the file name;

For example, there is a test.mp3 in g:\mp3

If you just echo %a, it will echo as g:\mp3\test.mp3

If you echo %~na, it will echo as test

Only the file name itself

@echo off
:: Please place this batch file on the desktop and run it.
echo The fully qualified pathname of this batch file is: %~f0
echo The drive letter of this batch file is: %~d0
pause>nul

Thanks everyone, got it!
Been to so many forums, but this one is the best!
It has a human touch! Haha~!~!~!

Learned a little more! Thanks!

Thanks for sharing, saved it

Thanks everyone, got it!

Okay, support the fall

Easy to understand, plus points.

Thanks for sharing