title_fqdn switch does nothing

[tidux]

hostname and hostname -f return the same value on most modern GNU/Linux systems with an actual FQDN applied. Here's an example without redacting anything but my PS1.

$ hostname > /tmp/hostname
$ hostname -f > /tmp/full-hostname
$ diff /tmp/hostname /tmp/full-hostname 
$ 

As you can see, the outputs of the two commands are identical and non-empty. The environment variable $HOSTNAME also evaluates to the same string.

$ hostname > /tmp/hostname
$ echo $HOSTNAME > /tmp/env-hostname
$ diff /tmp/hostname /tmp/env-hostname
$

A better way to get the short hostname and ensure no domain information leaks is to do the following:

hostname=$(hostname | cut -d. -f1)

That guarantees that no domain information leaks by trimming all but the leftmost element in a hostname.

[zeus86]

why not utilizing hostname -s, which is exactly made for this (and indeed on arch returns the shortname, even if hostname without parameters returns the fqdn-hostname).