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How to remove unused Docker containers and images
  1. Delete all containers

     $ docker ps -q -a | xargs docker rm
    

-q prints only the container IDs -a prints all containers

Notice that it uses xargs to issue a remove container command for each container ID

  1. Delete all untagged images

     $ docker rmi $(docker images | grep “^<none>” | awk ‘{print $3}’)
    

awk must use a single quote (this filters all image IDs)

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