Suse Linux Change Hostname (computer name) without yast

Display the current Suse Linux hostname

Type any one of the following command:
$ hostname
OR
$ hostnamectl

Suse Linux change hostname command

The procedure to change the computer name on Suse Linux:

1. Type the following command to edit /etc/hostname using nano or vi text editor:
   sudo vi /etc/hostname
2. Delete the old name and setup new name.
3. Next Edit the /etc/hosts file:
   sudo vi /etc/hosts
4. Replace any occurrence of the existing computer name with your new one.
5. Reboot the system to changes take effect:
   sudo reboot

How to change the SUSE Linux server hostname without a system restart?

Type the following commands:
$ sudo hostname new-server-name-here
Next edit the /etc/hostname file and update hostname:
$ sudo vi /etc/hostname
Finally, edit the /etc/hosts file and update the lines that reads your old-host-name:
$ sudo vi /etc/hosts
From:
127.0.1.1 old-host-name
To:
127.0.1.1 new-server-name-here
Save and close the file.

A note about hostnamectl command

Systemd based Linux distor such as SUSE Linux 12.x and above can simply use the hostnamectl command to rename hostname. To see current setting just type:
$ hostnamectl
Sample outputs:

   Static hostname: linux-mig6.suse
Transient hostname: linux-mig6
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 97b5d5396d5d1b2c11c0ea965a7456fb
           Boot ID: e29ed76aad154e7392fce498231c9a09
    Virtualization: kvm
  Operating System: SUSE Linux Enterprise Server 12 SP3
       CPE OS Name: cpe:/o:suse:sles:12:sp3
            Kernel: Linux 4.4.103-6.38-default
      Architecture: x86-64

To change hostname from linux-mig6 to suse-nixcraft, enter:
$ sudo hostnamectl set-hostname suse-nixcraft
$ hostnamectl

How to assign a static hostname to a server running SuSe Linux using yast

yast is universal configuration utility for SuSe/OpenSuSe. To setup hostname run yast command:
$ sudo yast
OR
$ sudo yast2

You must use the TAB and arrow keys to navigate YaST. In YaST, navigate to System, then Network Settings, and then press the Enter key. Use the arrow keys to navigate to Hostname/DNS and use the TAB key and Shift + TAB key combination to set options:

Next set the hostname and domain name to preferred values. Use the TAB key to navigate to [ OK ] and press the Enter key to save changes. Finally, use the TAB key to navigate to [Quit] and press the Enter key to exit app.