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Rename all ".JPG" files to ".jpg" under all subfolders...

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# 1  
Old 04-25-2010
Rename all ".JPG" files to ".jpg" under all subfolders...

Hi, Dear all:

One question ! ^_^
I'm using bash under Ubuntu 9.10.

My question is not to rename all ".JPG" files to ".jpg" in a single folder, but to rename all ".JPG" files to ".jpg" in all subfolders.

To rename all ".JPG" to ".jpg" in a single folder,
Code:
for x in *.JPG; do mv "$x" "${x%.JPG}.jpg"; done

works fine for me.

But how to recursively enter every subfolder and rename all the files?
(Well, if possible, enter every subfolder's subfolder.. recursively?? )

In sum, given a folder, all files under this folder, and all its subfolder, and all the subsubfolders, should be finally renamed in one specific rule.

How to deal with it?

Thank you very much and looking forward to your reply.

Best Regards
JIA Pei

Last edited by pludi; 04-25-2010 at 12:39 PM.. Reason: code tags, please...
# 2  
Old 04-25-2010
I guess this is far from a professional solution, but it seems to work:
Code:
$ du -a
0	./001.JPG
0	./002.JPG
0	./img1/a.JPG
0	./img1/b.JPG
2	./img1
0	./img2/1.JPG
0	./img2/2.JPG
0	./img2/pic10/pic1.JPG
0	./img2/pic10/pic2.JPG
2	./img2/pic10
4	./img2
8	.
$ 
$ du -a | cut -d '/' -f2- | grep JPG
001.JPG
002.JPG
img1/a.JPG
img1/b.JPG
img2/1.JPG
img2/2.JPG
img2/pic10/pic1.JPG
img2/pic10/pic2.JPG
$ 
$ for x in `du -a | cut -d '/' -f2- | grep JPG`; do mv "$x" "${x%.JPG}.jpg"; done
$ du -a
0	./002.jpg
0	./img1/b.jpg
0	./img1/a.jpg
2	./img1
0	./img2/2.jpg
0	./img2/pic10/pic2.jpg
0	./img2/pic10/pic1.jpg
2	./img2/pic10
0	./img2/1.jpg
4	./img2
0	./001.jpg
8	.
$

# 3  
Old 04-25-2010
Another way:

Code:
find /your/folder -type f | sed 's/\(.*\)\.JPG/mv \1.JPG \1.jpg/' | sh

# 4  
Old 04-25-2010
Quote:
Originally Posted by verdepollo
Another way:

Code:
find /your/folder -type f | sed 's/\(.*\)\.JPG/mv \1.JPG \1.jpg/' | sh

That approach comes with hefty filename limitations (which may or may not be of importance to the original poster, but I'll mention them for completeness):

- Filenames cannot contain newlines (when reading find's output, it's impossible to distinguish between two filenames and one with an embedded newline. Unfixable.
- Filenames cannot contain any of the other shell-special characters (space, tab, backslash, single-quote, double-quote, semicolon, ampersand, pipe, >, <, etc). Possibly fixable, by backslash escaping every such character, but it would be a brittle solution.

Unrelatedly, either find should be constrained to match only files ending in ".JPG" or the matching regular expression in sed should be anchored to the end of the line, with "JPG$". Otherwise, mid-filename ".JPG" sequences will match filenames not ending in ".JPG".

Regards,
Alister

---------- Post updated at 02:26 PM ---------- Previous update was at 01:52 PM ----------

If the solution must handle every allowable filename, I would suggest:
Code:
find . -type f -name \*.JPG -exec ./mvjpg.sh {} +

Where mvjpg.sh is:
Code:
#!/bin/sh

for f; do
    mv "$f" "${f%.JPG}.jpg"
done


Obviously, you'll need to adjust the path to the shell script in the -exec primary to match its actual location on your system, if it's not on your $PATH.

Regards,
Alister

Last edited by alister; 04-25-2010 at 03:08 PM..
# 5  
Old 04-25-2010
Dear alister:

This works perfect for me !!!!

Thank you very much !!! Thank you.

Best Regards
JIA
# 6  
Old 04-25-2010
Some shell parameter substitution might help.

Code:
 blar=foo.JPG
 echo ${blar/JPG/jpg}

will output:
Code:
foo.jpg

So that means you can do:

Code:
for JPG in `find /path -type f -name \*.JPG` ; do mv $JPG ${JPG/JPG/jpg} ; done

No need for a separate script.
# 7  
Old 04-26-2010
you can even use a simple rename command as
Code:
find -name '*.JPG' -exec rename .JPG .jpg {} \;

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