docker:tldr:f3304

The docker image prune --all command is used to remove all unused images from the local Docker image cache. Let's break down the different parts of this command:

• docker: This is the Docker command-line utility used to interact with Docker.
• image: This is a subcommand used to manage Docker images.
• prune: This is a specific action used to remove resources that are no longer in use.
• --all: This flag is used to prune all images, including both dangling (untagged or unused) images and all unused images (not just the dangling ones).

When you run this command, Docker will scan your local image cache and remove all images that are not being used by any running or stopped containers. This helps to free up disk space, especially if you have accumulated a large number of unused images over time.