[NTLUG:Discuss] format of /etc/hosts file

[m m]

Hi all:

Waht is the right format of /ect/hosts?

(1)

127.0.0.1 localhost  localhost.localdomain
or
127.0.0.1  localhost.localdomain localhost


(2)
192.168.1.1  host1  www aaa1.com bbb1.com ccc1.com
192.168.1.2  host2  www aaa2.com bbb2.com ccc2.com
or
192.168.1.1  host1
192.168.1.1 www.aaa1.com  aaa1.com
192.168.1.1  www.bbb1.com bbb1.com
192.168.1.1  www.ccc1.com  ccc1.com
192.168.1.1  host2
192.168.1.1 www.aaa2.com  aaa2.com
192.168.1.1  www.bbb2.com bbb2.com
192.168.1.1  www.ccc2.com  ccc2.com
or
192.168.1.1  host1
192.168.1.1 aaa1.com  www.aaa1.com
192.168.1.1  bbb1.com www.bbb1.com
192.168.1.1  ccc1.com  www.ccc1.com
192.168.1.1  host2
192.168.1.1 aaa2.com  www.aaa2.com
192.168.1.1  bbb2.com www.bbb2.com
192.168.1.1  ccc2.com  www.ccc2.com


basically, I am confused how /etc/hosts be read and applied by the 
application, expecially by apache, sanemail, qmail. (maybe none of then use 
it?!,  the order was set to host, dns)

thanks.

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