Brian Candler wrote:
> 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)

Thanks, that helped a lot.
I finally fixed it with

??? rvm package install readline
??? rvm remove 1.9.2-rc2
??? rvm install 1.9.2-rc2 -C --with-readline-dir=$HOME/.rvm/usr

http://rvm.beginrescueend.com/packages/readline/

Ray
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