How to change the hostname on your Ubuntu Shell?

There are two ways to check a hostname on your system:

1. Open a content of the file /etc/hostname with the command cat.

cat /etc/hostname

You will get an output with a hostname:

localhost

2. Run in a terminal:

hostnamectl

Sample Output:

As you can see, there is more information available.

Changing the hostname on Ubuntu 20.04

There are a couple ways of changing a hostname on your Ubuntu system.

The most easiest option is to run the following command:

sudo hostnamectl set-hostname *your hostname*

Another method is to edit the following files with any text editor:

/etc/hostname
/etc/hosts

Finally, you can confirm the changes by running the hostnamectl command again.