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Can anyone please help me to figure out,How can I change my localdomain name from something say user@host.localdomian to user@host.something ??

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Either edit the file /etc/hostname or issue sudo echo "my_hostname" >> /etc/hostname (replacing "my_hostname" with the name you want for the system). The file is owned by root so you will have to invoke sudo privileges to make changes to it.

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I dont want edit my host name I want to change my domain name from localhost.localdomain to localhost.something –  Arush Salil May 30 '13 at 16:55
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Doing as I said will accomplish that. You can enter a fictional or FQDN element as part of the hostname such as myserver.mydomain.local or myserver.mydomain.com. If you are using a FQDN to resolve the server, you will also need to edit /etc/hosts and add your FQDN to the IP address listening for those queries. Read man hostname. –  douggro May 30 '13 at 20:55
    
Thank you that really helped and well sorry for miss trusting you at the first time :-) –  Arush Salil Jun 2 '13 at 23:04
    
No worries. Glad that you got it set as you wanted. –  douggro Jun 2 '13 at 23:24

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