Batch resize and rename image files in subdirectories

I'm trying to resize and rename several hundred subdirectories of images. The files that I need to be changed:

End with A.jpg
Need to be resized down to 400x400
Renamed to A@2x.jpg

Example: images/**/A6919994719A@2x.jpg

I got the resizing bit down in one directory. I'm having some trouble finding a way to rename just the end of the file, not the extension, and executing it through the subdirectories.

Any help would be appreciated.

#!/bin/bash

for i in $( ls *A.jpg); do convert -resize 400x400 $i

Solution

You can do this:

#!/bin/bash
find . -name "*A.jpg" | while read f
do
   newname=${f/A.jpg/A@2.jpg}
   echo convert "$f" -resize 400x400 "$newname"
done

Remove the word echo if it looks correct, and run only on files you have backed up.

You can also do it in a one-liner, if you really want to:

find . -name "*A.jpg" -exec bash -c 'old="$0";new=${old/A.jpg/A@2.jpg};echo convert "$old" -resize 400x400 "$new"' {} \;