What happen when 'unable to resolve host' still exist on terminal?

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http://askubuntu.com – After editing etc/hosts and hostname, 'unable to resolve host' still exist on my terminal, I still don't know what is the cause. Although my computer and my terminal runs so well. I'm only using single OS Ubuntu 12.04.1 hostname: Precise hosts: localhost Precise The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters host.conf: The "order" line is only used by old versions of the C library. order hosts,bind multi on (HowTos)