From: Brian Candler <b.candler@...>
Date: 2010-08-17T19:40:59+09:00
Subject: Re: Weirdest IRB / Rails console problem

Only a guess, but maybe a problem with libreadline?

Try:    irb --noreadline

and see if you can type normally. (Admittedly, not having line editing 
is a real pain, but it would help to localise the problem)

If this is the problem: you could check /etc/inputrc, ~/.inputrc and the 
INPUTRC environment variable (echo $INPUTRC)
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