Changing the Raspberry Pi's Hostname
Old Method
Simply edit /etc/hostname and /etc/hosts (eg. via sudo nano /etc/hostname) replacing raspberrypi in a similar fashion to that shown in the screenshot below:
(and then restart your Pi)
NB: /etc/hostname is not a script file and the name there has to be replaced rather than #-commented out (something I forgot when working with a Model A Pi months after creating this page!)
New Method - An option in raspi-config:
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