/etc/hosts

I am a new Alpine Linux user. By default, my server name is set to ‘localhost’ during installation. Now, I would like to change the computer name. How do I change the Alpine Linux computer name? Can you tell me more about Alpine Linux change hostname command?
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I am a new Ubuntu Linux server user. My server is running on AWS cloud. By default they set my VM name to ‘ip-172-26-12-173’ during creation of VM but now I would like to change the computer name to ‘wsl-us-west2-www1’. How do I set hostname permanently on Ubuntu Linux 18.04 LTS? Can you tell me more about Ubuntu command to set hostname permanently?
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I am a new Ubuntu Linux laptop user. I setup my computer name to ‘tom’ during installation but now I would like to change the computer name to ‘jerry’. Can you tell me how do I remove tom and set it to jerry on Ubuntu Linux? How do I change the Ubuntu computer name from ‘ubuntu’ to ‘AvlinStar’? Can you tell me more about Ubuntu Linux change hostname command?
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