As described at it’s straight forward:

sudo /bin/hostname mynewhostname

Supplying the path to the binary is for security reasons, I guess, to make sure we have the right bin (eventhough it could have been replaced there, too…).

But the people at debianadmin.com forgot to mention in order to avoid “hostname: Unknown Host” you have to

sudo edit /etc/hosts

and change it there, too!

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