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Merge pull request #855 from samjsharpe/fix_missing_hyphen
Build from Dockerfile on stdin requires a hyphen
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@ -18,7 +18,7 @@ steps and commit them along the way, giving you a final image.
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To use Docker Builder, assemble the steps into a text file (commonly referred to
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as a Dockerfile) and supply this to `docker build` on STDIN, like so:
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``docker build < Dockerfile``
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``docker build - < Dockerfile``
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Docker will run your steps one-by-one, committing the result if necessary,
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before finally outputting the ID of your new image.
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