ubuntu set host name

http://wiki.joyent.com/wiki/display/jpc2/Setting+the+Host+Name+on+a+Linux+VM

• Set the host name in the /etc/hostname file:
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  echo "ubuntu.example.com" > /etc/hostname

• Using any text editor, edit the file /etc/hosts so that the hostname points to the localhost address:
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  127.0.0.1       localhost 127.0.1.1       ubuntu.example.com localhost    # The following lines are desirable for IPv6 capable hosts ::1     localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters ff02::3 ip6-allhosts

• Invoke the host name initialization script(if following command not work, you can reboot system).
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  start hostname