Add 1 character at the start of each filename

Question

I want to put 1 character at start of each jpg filename. I have made this batch file:

for %%A in (*.jpg) do ren "%%~A" s"%%~nA%%~xA"

This works almost perfectly, but the first file is processed twice:

ssNL201501
sNL201502
sNL201503

What do I do wrong?

score 4 · Accepted Answer · edited Mar 20 '17 at 10:17

This works almost perfectly, but the first file is processed twice

for %%A in (*.jpg) do ren "%%~A" s"%%~nA%%~xA"

You need to use:

for /f %%A in ('dir /b *.jpg') do ren "%%~A" s"%%~nA%%~xA"

As dbenham explains in his answer to add “text” to end of multiple filenames:

Note that it is critical that you use FOR /F and not the simple FOR. The FOR /F gathers the entire result of the DIR command before it begins iterating, whereas the simple FOR begins iterating after the internal buffer is full, which adds a risk of renaming the same file multiple times.

Add 1 character at the start of each filename

1 Answers1

This works almost perfectly, but the first file is processed twice

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