Change hostname method under Linux hostname

First, permanent modification
Modify the/etc/sysconfig/network to specify the host name Hostname=
then execute the command .
hostname Host name
this time can write off the system, and then re-login after the line.

or modify the/etc/hosts file to add
192.168.2.13 Linux # # # #ip + host name
Then:
hostname Host name
this time you can unregister the system, and then re-login

Second, temporary modification:
execute under Shell:
#hostname Host name
ctrl+d Log off the system and re-login

first modify with HOSTNAME, then export hostname= the new host name

Change hostname method under Linux hostname