setting env vars

[Net Llama!]

I've got a two pronged question regarding environmental variables (under
bash):

1) Is it possible to use env vars for things like IP addresses & hostnames
in files in /etc/hostname & /etc/hosts?
2) If so, where would be the best place to set them, so that they are
identified at bootup?

thanks

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lonni J Friedman				netllama at linux-sxs.org
Linux Step-by-step & TyGeMo		     http://netllama.ipfox.com