Sorry, that may have been a bit unclear. Too much caffeine, plus a tendency
to forget that some of these questions aren't coming from work. :)
Anyway, much more clearly, and with a solution for the original poster:
In /etc/hosts, never remove the 127.0.0.1/localhost entry, either in its
entirety, or by changing localhost.
In /etc/hosts, if you have already set up your machine to respond to one or
more additional IP addresses, you may alias each of these IPs to one or
more hostnames.
using the /usr/bin/hostname command, you may define one of these names to
be the default hostname. You may also use this command to assign a
default hostname that does not exist in /etc/hosts, but this is bad
practice.
To address the original poster's concern, using KDE (or was it CDE? Don't
recall) or any other graphical front-end will present problems for login
if you've removed or otherwise changed the localhost entry. Bring the
machine up in single-user mode, login as root, and make sure localhost
exists in /etc/hosts, and make sure your machine responds to whatever
hostname you've set as default.
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