I ex­pe­ri­enced a problem for years on FreeBSD, but have never been motivated to solve it until now. The problem presents when attempting to set FQDN of the system (nastie.weller-fahy.com). I set hostname to the proper value in /etc/rc.conf.

hostname="nastie.weller-fahy.com"

When I type hostname at the prompt, I am given the un­qual­i­fied hostname, nastie. When it bit me tonight, I finally tried to find a solution, and (shock of all shocks) found one!

So, to sum up, create an executable file /etc/dhclient-enter-hooks with the following content.

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#!/bin/sh
check_hostname(){
    hostname nastie.weller-fahy.com
}

Next time you reboot, the hostname command will result in the FQDN of your system, as it should.