Using a Raspberry Pi, and a few accessories you can create a small, lightweight Linux terminal for mobile computing.
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Pro Instructions easy to understand
The instructions include a video, and following along step by step is easy to do.
Con You will be cutting up your Pi
To make this device, it requires you remove some of the ports and rewire them. In effect you will be rearranging how your Pi works, and it will require some advanced electronic knowledge to put it back to it's default state.
Con Small screen size
at 3.5 inches, the screen for the project is tiny, and may be hard to use for older individuals.