Decapper: A Command-Line Tool for Efficient Docker Image Management

Decapper is a command-line tool for Docker that allows you to remove unnecessary layers from an image. It can help reduce the size of the image and make it more efficient.

Here are some examples of how you can use decapper:

1. Remove all layers except the most recent one:
```
$ decapper myimage
```
2. Remove all layers older than a specific date:
```
$ decapper myimage --since=2022-01-01
```
3. Remove all layers that do not contain a specific file:
```
$ decapper myimage --not-found=myfile.txt
```
4. Remove all layers that are not needed for the current Docker configuration:
```
$ decapper myimage --unused
```
Note that decapper can only be used on images that have been pulled from a registry, and it will only remove layers that are not necessary for the current Docker configuration. It will not remove any layers that are required for the image to run correctly.