Change it permanently:

echo "mynewpcname" > /etc/hostname

(or open it in your favorite root editor)

Change it now:

hostname mynewpcname

Then log out and log in again. No need to reboot.

And if the old name is in /etc/hosts, change it there, too.

I do this way too thanks for confirming me....
However on a PI III B, the above method does not work.

About Hostname: SystemD is ugly, isn't it??

Plus, So, it means the following:  This page would need a small update.
https://wiki.debian.org/HowTo/ChangeHostname

echo "mynewpcname" > /etc/hostname

(or open it in your favorite root editor)

Change it now:

hostname mynewpcname

Then log out and log in again. No need to reboot.

And if the old name is in /etc/hosts, change it there, too.

Hello,

How to change the Hostname in DEVUAN ?

Probably the method echo "mynewpcname" > /etc/hostname with after a reboot, is not the official one

thank you

well that's how I do it, it actually says in the man page for hostname, that editing etc/hostname is the only way of permanently changing it.

How to change the Hostname in DEVUAN ?

Probably the method echo "mynewpcname" > /etc/hostname with after a reboot, is not the official one

thank you