Improve help output.
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@ -227,8 +227,9 @@ How to use the image:
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sudo docker rmi $library_image
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# ^ Remove a docker image (This is necessary after updating the unversioned Docker image to avoid cached RUN commands from doing nothing when the script after RUN changes).
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sudo docker image prune
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sudo docker image prune --force
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# ^ Prune unused images (For this to do anything, first delete containers using the image).
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# --force: Do not ask for confirmation.
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sudo docker ps -a
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# ^ List containers and show NAMES (The name is necessary for certain subcommands such as exec which operate on a running container).
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