Add usage of strict shell (#1841)
Co-authored-by: Rico Sta. Cruz <rstacruz@users.noreply.github.com>
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@ -47,6 +47,20 @@ ADD file.xyz /file.xyz
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COPY --chown=user:group host_file.xyz /path/container_file.xyz
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```
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### Run commands in strict shell
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```docker
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ENV my_var
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SHELL ["/bin/bash", "-euo", "pipefail", "-c"]
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# With strict mode:
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RUN false # fails build like using &&
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RUN echo "$myvar" # will throw error due to typo
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RUN true | false # will bail out of pipe
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```
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Using `shell` will turn on strict mode for shell commands.
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### Onbuild
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```docker
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