How to change hostname in Linux

[root ~]# hostname
old-name

[root ~]# hostname new-name
[root@ ~]# hostname
new-name

[root ~]# vi /etc/sysconfig/network
[root ~]# vi /etc/hosts

[root ~]# pwd
/root
[root ~]# service network restart
Shutting down interface eth650_1.989:                      [  OK  ]
Shutting down interface eth1290_2.989:                     [  OK  ]