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WORKDIR is like calling mkdir - but we've not told people

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

Sven Dowideit authored on 2016/03/19 21:20:40
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@@ -1021,6 +1021,8 @@ and for any `RUN`, `CMD` and `ENTRYPOINT` instructions that follow it in the
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 The `WORKDIR` instruction sets the working directory for any `RUN`, `CMD`,
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 `ENTRYPOINT`, `COPY` and `ADD` instructions that follow it in the `Dockerfile`.
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+If the `WORKDIR` doesn't exist, it will be created even if its not used in any
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+subsequent `Dockerfile` instruction.
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 It can be used multiple times in the one `Dockerfile`. If a relative path
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 is provided, it will be relative to the path of the previous `WORKDIR`