I decided to look into the source code: http://package-
import.ubuntu.com/h/hostname/intrepid/annotate/head%3A/hostname.c
169 if (!check_name(name))
170 warnx("the specified hostname is
invalid");
171
172 if (sethostname(name, strlen(name))) {
I'm not really a c expert but this looks like to me that it checks if
the hostname is correct but after the error message it just continues to
set the hostname no matter what.
--
/bin/hostname complains about but still sets invalid hostname
https://bugs.launchpad.net/bugs/52335
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