Merge pull request #11203 from rhatdan/Dockerfile
We had some testers who found a hard to diagnose bug in Dockerfile
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@ -97,6 +97,9 @@ A Dockerfile is similar to a Makefile.
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exec form makes it possible to avoid shell string munging. The exec form makes
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it possible to **RUN** commands using a base image that does not contain `/bin/sh`.
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Note that the exec form is parsed as a JSON array, which means that you must
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use double-quotes (") around words not single-quotes (').
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**CMD**
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-- **CMD** has three forms:
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@ -120,6 +123,9 @@ A Dockerfile is similar to a Makefile.
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be executed when running the image.
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If you use the shell form of the **CMD**, the `<command>` executes in `/bin/sh -c`:
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Note that the exec form is parsed as a JSON array, which means that you must
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use double-quotes (") around words not single-quotes (').
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```
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FROM ubuntu
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CMD echo "This is a test." | wc -
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