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Merge pull request #16253 from AmeBel/update-documentation-on-run

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add a documentation note on backslash usage in shell form of RUN
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moxiegirl 2015-09-14 06:32:20 -07:00
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docs/reference/builder.md
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@ -295,6 +295,17 @@ any point in an image's history, much like source control.
The *exec* form makes it possible to avoid shell string munging, and to `RUN`
commands using a base image that does not contain `/bin/sh`.
In the *shell* form you can use a `\` (backslash) to continue a single
RUN instruction onto the next line. For example, consider these two lines:
```
RUN /bin/bash -c 'source $HOME/.bashrc ;\
echo $HOME'
```
Together they are equivalent to this single line:
```
RUN /bin/bash -c 'source $HOME/.bashrc ; echo $HOME'
```
> **Note**:
> To use a different shell, other than '/bin/sh', use the *exec* form
> passing in the desired shell. For example,