From: "Marvin Gülker" <sutniuq@...>
Date: 2010-01-10T18:40:09+09:00
Subject: Re: roll back to last command in irb

Ruby Newbee wrote:
> Hello,
> 
> I'm using ruby under ubuntu Linux, ruby version is 1.9.1
> What the problem is, when using irb I can't roll back the command to
> the last one with "up" key in keyboard.
> The result as below:
> 
> irb(main):001:0> File.file? "/etc/passwd"
> => true
> irb(main):002:0> ^[[A      # can't roll back here
> 
> Do you know how to configure irb to resolve it?
> 
> Thanks.

Did you compile Ruby yourself? If so, install one of the packages 
libreadline5-dev or libreadline6-dev and then compile again.

Marvin
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