uname instead of hostname

[t-h2o]

uname in much more portable between MacOS
and differents GNU/Linux distros

uname is a GNU coreutils

[pin]

Apology for slow response!

Say, the hostname is test.example.org, then:

hostname -d would return example.org, but
uname -n would return test.

So it would not work as direct replacement, unfortunately.

Please feel free to re-open if I'm missing something!!

[t-h2o]

No problem for slow response, thank you for your feedbacks !

A comparison between commands

$ docker run -it --hostname my.very.long.domain.name debian:11 sh
# hostname -d
very.long.domain.name
# hostname
my.very.long.domain.name
# uname -n
my.very.long.domain.name

No, uname -n do not just return my but all the hostname.

hostname -d remove the first ^\w\+., in this case my.

I do not understand why we should remove the first part of the domain name