Use a Linux terminal on your Android phone: 
When it comes to ultra-mobile computing, I prefer the PocketCHIP or a Raspberry Pi with a screen rather than a mobile phone or tablet. These solutions offer a pure Linux environment that’s as open source as the hardware allows and make no assumptions about how I expect to work.
read more: Opensource.com sethkenlon
Supporting Open Source.
Have you tried: Diving with Sharks?