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Merge pull request #22906 from nshalman/patch-1

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Clarification about 'docker build --build-arg'
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Vincent Demeester 2016-05-24 15:33:27 +02:00
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docs/reference/commandline/build.md
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@ -299,6 +299,9 @@ accessed like regular environment variables in the `RUN` instruction of the
Dockerfile. Also, these values don't persist in the intermediate or final images
like `ENV` values do.
Using this flag will not alter the output you see when the `ARG` lines from the
Dockerfile are echoed during the build process.
For detailed information on using `ARG` and `ENV` instructions, see the
[Dockerfile reference](../builder.md).