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To temporarily change the Hostname of your device via the terminal 

Set or Change Hostname (via Terminal) - OS X Mavericks or newer

• Open Terminal by going to Applications, then Utilities, and select Terminal

• The type the following:

sudo hostname -s new_hostname
For example:  sudo hostname -s ECE-MAC

To permanently change the Hostname of your device via the terminal

Set or Change Hostname (via Terminal) - OS X 10.6 - 10.8

• Open Terminal by going to Applications, then Utilities, and select Terminal

• The type the following:

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