> Maybe it is the case that your sh actually does not follow the "shall"
> above.
>
>
It seems so.
When I do
$ sh --version
sh: 0: Illegal option --
which is weird since:
$ man sh
...
--version
Affiche le numéro de version de bash sur la sortie standard
et
termine avec succès.
...
[but it finishes with the version at the bottom:]
...
GNU Bash 4.3
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