#1.Install packages to allow apt to use a repository over HTTPS:
sudo apt install apt-transport-https ca-certificates curl software-properties-common

#2.Add Docker’s official GPG key:
curl -fsSL | sudo apt-key add -

#3.Use the following command to set up the stable repository.
sudo add-apt-repository "deb [arch=amd64] $(lsb_release -cs) stable"

#4.Update the apt package index.
sudo apt update

#5.Install the latest version of Docker CE
sudo apt install docker-ce

#6.Ensure that you have a supported version of Docker:
docker version

#7.Verify that Docker CE is installed correctly by running the hello-world image.
sudo docker run hello-world

#8.List the hello-world image that was downloaded to your machine:
docker image ls

#9.List the hello-world container (spawned by the image) which exits after displaying its message. If it were still running, you would not need the --all option:
docker container ls --all

#10.Search the Docker Hub for images
docker search <image>

#11.Start container
docker start <name>

#12.Attach container
docker attach <name>

#13.Commit image
docker commit -m="has update" -a="comet" ea4c82dcd15a comet/ubuntu:v2

#20.Other command
docker build -t friendlyhello . # Create image using this directory's Dockerfile
docker run -p 4000:80 friendlyhello # Run "friendlyname" mapping port 4000 to 80
docker run -d -p 4000:80 friendlyhello # Same thing, but in detached mode
docker container ls # List all running containers
docker container ls -a # List all containers, even those not running
docker container stop <hash> # Gracefully stop the specified container
docker container kill <hash> # Force shutdown of the specified container
docker container rm <hash> # Remove specified container from this machine
docker container rm $(docker container ls -a -q) # Remove all containers
docker image ls -a # List all images on this machine
docker image rm <image id> # Remove specified image from this machine
docker image rm $(docker image ls -a -q) # Remove all images from this machine
docker login # Log in this CLI session using your Docker credentials
docker tag <image> username/repository:tag # Tag <image> for upload to registry
docker push username/repository:tag # Upload tagged image to registry
docker run username/repository:tag # Run image from a registry

#21.Docker command
attach Attach local standard input, output, and error streams to a running container
build Build an image from a Dockerfile
commit Create a new image from a container's changes
cp Copy files/folders between a container and the local filesystem
create Create a new container
diff Inspect changes to files or directories on a container's filesystem
events Get real time events from the server
exec Run a command in a running container
export Export a container's filesystem as a tar archive
history Show the history of an image
images List images
import Import the contents from a tarball to create a filesystem image
info Display system-wide information
inspect Return low-level information on Docker objects
kill Kill one or more running containers
load Load an image from a tar archive or STDIN
login Log in to a Docker registry
logout Log out from a Docker registry
logs Fetch the logs of a container
pause Pause all processes within one or more containers
port List port mappings or a specific mapping for the container
ps List containers
pull Pull an image or a repository from a registry
push Push an image or a repository to a registry
rename Rename a container
restart Restart one or more containers
rm Remove one or more containers
rmi Remove one or more images
run Run a command in a new container
save Save one or more images to a tar archive (streamed to STDOUT by default)
search Search the Docker Hub for images
start Start one or more stopped containers
stats Display a live stream of container(s) resource usage statistics
stop Stop one or more running containers
tag Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
top Display the running processes of a container
unpause Unpause all processes within one or more containers
update Update configuration of one or more containers
version Show the Docker version information
wait Block until one or more containers stop, then print their exit codes

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