1) Edit file /etc/sysconfig/network using your favourite editor.
vi /etc/sysconfig/network
2) Look for HOSTNAME=xxxxxx
3) Change the xxxx to the name you wish to set for your computer. (ex:HOSTNAME=abc.com)
4) Save the file and restart the network service. (ex: type service network restart in your shell)
Done! You have just changed your hostname in Linux platform
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source:http://linuxpoison.blogspot.com/2008/01/13578175804401.html