Dockerfile
FROM ruby RUN gem install reverse_markdown redcarpet
EXE
docker build . -t ruby-gems
$ echo '<h1>hey</h1>' | docker run -i ruby-gems reverse_markdown # hey $ echo "abc" | docker run -i ruby-gems redcarpet <p>abc</p>
# Maybe badcase
$ docker run ruby-gems /bin/bash -c "echo '<h1>head</h1>' | reverse_markdown" # head $ docker run ruby-gems /bin/bash -c "echo '# h1' | redcarpet" <h1>h1</h1>
ref
Original by Github issue
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