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Ubuntu Linux Change Hostname (computer name)

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’. How can I remove tom and set it to jerry on Ubuntu Linux? How do I change the Ubuntu computer name from ‘ubuntu’ to ‘AvlinStar’?
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CentOS Linux 5/6 Change Hostname Command

I am a new CentOS Linux server user. How do I change hostname on CentOS Linux? How can I change server hostname on CentOS Linux version 5 or 6?
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Debian Linux: Change Hostname / Computer Name Permanently

How do I change the hostname of a Debian Linux system permanently using the command line tools?
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