Changing the hostname

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Hi,

I am changing the hostname on Ubuntu 24.04LTS server.

I do the following:

Change the hostname using sudo vi /etc/hostname
Change the hostname using sudo vi /etc/hosts
Restart : sudo systemctl restart systemd-hostnamed
Verify with : hostnamectl which returns the new hostname

However when I issue the command "hostname" it gives me the old 
hostname.

When I do a reboot the command hostname give the new hostname.

Any thoughts why this is?

Thanks!!
Keith