Change Hostname of linux system

Open below mentioned file and change name. Reboot the system.

For debian based linux :

sudo vi /etc/hostname

sudo vi /etc/hosts
Add a new line below localhost as:
anukul@DT232:~$ cat /etc/hosts
127.0.0.1 localhost
127.0.1.1 DT232
For redhat based linux & others: 
sudo vi /etc/sysconfig/network
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