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Change Hostname on Linux with CLI

1. Check your current hostname

Check what your current hostname is with hostnamectl or hostname command.

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2. Change hostname

Change the hostname with hostnamectl command.

hostnamectl set-hostname new-hostname

I want to change mine to lyn, so 

hostnamectl set-hostname lyn

3. Confirm change

hostname

hostnamectl

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4. (Optional) Set pretty hostname

A pretty hostname is the name displayed to the user, not the name used by other computers on a network. Computers identify each other using the static hostname.

To update the pretty hostname of a machine, you can use the hostnamectl command with the --pretty option.

hostnamectl set-hostname new-hostname --pretty