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Merge pull request #3680 from muru/patch-1 

docs: fix misleading example of setting an env variable for a single command
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Sebastiaan van Stijn 2022-06-21 10:36:11 +02:00 committed by GitHub
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docs/reference/builder.md
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@ -1060,7 +1060,7 @@ If an environment variable is only needed during build, and not in the final
image, consider setting a value for a single command instead:
```dockerfile
RUN DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y ...
RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y ...
```
Or using [`ARG`](#arg), which is not persisted in the final image: