Add host-name to linux

How to add an IP to hostname file?

Edit file /etc/hosts and add line:
<ip_address> <full_qualified_host_name>  <hostalias_name>


say example: you are editing hosts file in vim, you can insert following at the bottom of the file

192.197.190.195 trianz_server.trianz.com trianz_serve

192.197.190.195 trianz_server.trianz.com mydummyname