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I wonder if there is anything else that might conceivably be used to input commands. I am sure there must be some imaginative possibilities!

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This isn;t really Ubuntu-specific,and may be closed as off-topic. –  hexafraction Oct 6 '12 at 13:49
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UEFI BIOS can be pointer-device-controlled. Ubuntu installation can be done all-mouse anyway. –  Takkat Oct 6 '12 at 14:14
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closed as off topic by hexafraction, Takkat, devav2, Jorge Castro, Rafał Cieślak Oct 6 '12 at 19:56

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up vote 2 down vote accepted

I have done a small research based on your interesting question, assuming to find nothing, but I have met these:

These are funny devices for entering text like playing a piano, you use one or more keys together to enter characters. The first one has been designed for so called wearable computing.

Don't know if you're seriously looking for a replacement for keyboard, but if you're just curious you may read this : http://dl.acm.org/citation.cfm?id=54675.54695 . It looks like some large document on input.

Also voice recognition is an option, but for bios, not this decade I guess :)

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