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The hostname in OS X often defaults to "localhost" or some variation of "ComputerName-local". If you want to set a different hostname that will be reflected at the command prompt, here's how to do it quickly with the hostname command.

To see the changes, you'll need to start a new terminal session either by opening a new window, restarting terminal, or starting a new shell.

For persistent changes to the hostname, use the scutil command instead, as shown in this walkthrough: http://www.youtube.com/watch?v=j7BhXkKbfe0&feature=youtu.be

You can read more about hostname changes here: http://osxdaily.com/2010/09/06/change-your-mac-hostname-via-terminal/

http://osxdaily.com