Renaming file extension in batch

Question

I've got a few files like this:

files

I'm wanting to change them all to *.gz

This is the code I've written to try to change the file extensions:

ren *.dat.gz.gz.gz.gz *.gz

But this doesn't do anything. Thanks.

http://superuser.com/questions/608128/how-to-batch-rename-and-remove-last-characters — Alex K., Mar 28 '14 at 16:23
@AlexK. - Actually that link did not have an optimal answer. I've since added a much simpler solution using only a single REN command :-) It is basically the same as MC ND's answer. — dbenham, Mar 29 '14 at 02:40

score 1 · Answer 1 · answered Mar 28 '14 at 18:47

1

ren ????????.dat.gz.* ????????.gz

or, if the .dat part is needed

ren ????????.dat.gz.* ????????.dat.gz

answered Mar 28 '14 at 18:47

MC ND

For an explanation as to why this works, see http://superuser.com/q/475874/109090 – dbenham Mar 29 '14 at 02:32

score 0 · Answer 2 · answered Mar 28 '14 at 16:55

Try this:

@echo off
setlocal enabledelayedexpansion

for %%a in (*.gz) do (
   set "file=%%a" 
   set "file=!file:.gz.gz.gz=!"
   echo ren "%%~nxa" "!file!"
)

Run it from the location of the .gz files. Remove the Echo when the screen output looks right.

score 0 · Answer 3 · answered Mar 28 '14 at 17:02

0

It works too:

@echo off
for /f %%a in ('dir /b /s *.gz') do (
 for /f "delims=. tokens=1" %%b in ('echo/%%~na') do (ren "%%a" "%%b.gz")
)

answered Mar 28 '14 at 17:02

Rafael

3 Answers3