I have a directory full of images:

```
DSCN4749.JPG
DSCN4750.JPG
DSCN4892.JPG
...

```

And I would like a one-liner to rename them to (say).

```
dscn4749.jpg
dscn4750.jpg
dscn4892.jpg
...

```

How do I do this?

Alternatives/extenstions/caveats

* I want to recurse
* The directory contains a mix of file types I only want to rename DSCN\*.JPG files.
* bash solution
* perl solution
* zsh solution
* I want a new directory tree with hard links existing files.
* I want to change name more than just a case change eg dscn5555.JPG to 05555.jpg

...