docker images -f dangling=true
command is used to list all "dangling" or unused images in your Docker environment. Dangling images are those that are not associated with any containers.
When you run this command, Docker will show you a list of images that are not associated with any containers. You can then decide whether to remove these dangling images using the `docker image prune` command.
If you want to remove dangling images, you can use the following command:
docker image prune
This command will prompt you for confirmation before removing the dangling images. If you want to automatically remove them without confirmation, you can use the `-f` or `--force` option:
docker image prune -f
Make sure you understand the implications of removing images, especially if they are still being used by other containers or applications.