i am new to linux and want to change the host name when i do it with
host name new-name , it doesn't change permanently.
Can any one help me in this ??

My linux version as below

[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.32-300.10.1.el5uek #1 SMP Wed Feb 22 17:37:40 EST 2012 x86_64 x86_64 x86_64 GNU/Linux

That tells you kernel version but not Linux distro. However, your kernel ending in uek suggests Oracle's Unbreakable Linux (uek = unbreakable enterprise kernel). You can cat /etc/issue or other files in /etc to determine Linux distro.

Anyway Oracle's Linux was derived from RedHat Enterprise Linux (RHEL) so you can probably change it by editing /etc/sysconfig/network to change the hostname there. Also don't forget to update your /etc/hosts file to show the new name.

If you do a reboot after changing these the next boot should have the new hostname.

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See this link. It describes both temporary and permanent changes to hostname.

-->http://www.ducea.com/2006/08/07/how-...-linux-system/

If you have Fedora/Centos the command line hostnamectl program makes it easy to manage the host name

Keep in mind that hostnamectl is a systemd command, so it is not present in CentOS/RHEL versions older than 7.