[systemd-devel] shutdown now --no-wall # messages & the lack thereof

[F. Fox]

> It appears that the systemctl implementation has changed the behaviour,
> and the documentation. Whether there is a spec anywhere (POSIX or
> whatever) I do not know - but certainly a man page is not a spec.

systemd might still be UNIX compliant here, as
https://pubs.opengroup.org/onlinepubs/9699919799/idx/utilities.html does
not seem to include shutdown, meaning it is not covered by the standard.
quick search gave me nothing by UNIX, POSIX, IEEE or OpenGroup.