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add missing instruction

Signed-off-by: bin liu <liubin0329@gmail.com>

bin liu authored on 2015/08/19 19:41:34
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@@ -949,6 +949,7 @@ For example:
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     ENV DIRPATH /path
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     WORKDIR $DIRPATH/$DIRNAME
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+    RUN pwd
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 The output of the final `pwd` command in this `Dockerfile` would be
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 `/path/$DIRNAME`