mjhjmtu

How to recursively rename all the files in several layers of subdirectories without changing their extensions?

Below's a toned down version (to save room) of what I've got.
For argument's sake, I want all the files to have the same title, yet retain their original extension. There's never more than a single file per directory, so there's no chance of doubling up.

For simplicity, we'll just call them all foo, followed by their current extension.

So just to clarify:
Asset 1.pdf, Asset 1.png, Asset 1@4x.png, Asset 1.svg

Will become:
foo.pdf, foo.png, foo.png, foo.svg

And so on in that fashion.

I would typically use parameter expansion and a for loop, like:

for f in */*; do mv "$f" "$f%/*/foo.$f##*."; done 

But it's not recursive. So I would prefer to use something with find..-exec or similar.

~/Desktop/Project/Graphics/
├── Huge
│   ├── PDF
│   │   └── Asset 1.pdf
│   ├── PNG
│   │   ├── 1x
│   │   │   └── Asset 1.png
│   │   └── 4x
│   │   └── Asset 1@4x.png
│   └── SVG
│   └── Asset 1.svg
├── Large
│   ├── PDF
│   │   └── ProjectAsset 2.pdf
│   ├── PNG
│   │   ├── 1x
│   │   │   └── ProjectAsset 2.png
│   │   └── 4x
│   │   └── ProjectAsset 2@4x.png
│   └── SVG
│   └── ProjectAsset 2.svg
├── Medium
│   ├── PDF
│   │   └── ProjectAsset 3.pdf
│   ├── PNG
│   │   ├── 1x
│   │   │   └── ProjectAsset 3.png
│   │   └── 4x
│   │   └── ProjectAsset 3@4x.png
│   └── SVG
│   └── ProjectAsset 3.svg
├── Small
│   ├── PDF
│   │   └── ProjectAsset 4.pdf
│   ├── PNG
│   │   ├── 1x
│   │   │   └── ProjectAsset 4.png
│   │   └── 4x
│   │   └── ProjectAsset 4@4x.png
│   └── SVG
│   └── ProjectAsset 4.svg
└── Tiny
 ├── PDF
 │   └── Asset 5.pdf
 ├── PNG
 │   ├── 1x
 │   │   └── Asset 5.png
 │   └── 4x
 │   └── Asset 5@4x.png
 └── SVG
 └── Asset 5.svg

30 directories, 20 files

Maybe I'm oversimplifying, but, if you know the max depth of the directory hierarchy (here: 3), why not

for f in */* */*/* */*/*/*; do ... ; done 

adding some error checking?

It's very similar with find...-exec: invoke a shell so that you can use parameter expansion, extract the PARENT directory and the EXTENSION so that you can construct the new filename as PARENT/NAME.EXTENSION and then move/rename:

find target_dir -type f -exec sh -c '
h=$1%/*; mv "$1" "$h/NAME.$1##*."' sh ;

If you want to dry-run the above, insert an echo before the mv...