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Remove default assertion for dash shell
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@ -463,8 +463,8 @@ RUN set -o pipefail && wget -O - https://some.site | wc -l > /number
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```
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> Not all shells support the `-o pipefail` option.
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>
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> In such cases (such as the `dash` shell, which is the default shell on
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> Debian-based images), consider using the _exec_ form of `RUN` to explicitly
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> In cases such as the `dash` shell on
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> Debian-based images, consider using the _exec_ form of `RUN` to explicitly
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> choose a shell that does support the `pipefail` option. For example:
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>
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> ```Dockerfile
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