From: Kero <kero@...>
Date: 2005-11-22T17:42:24+09:00
Subject: Re: Command buffer in irb

On 2005-11-22, Eric Hodel <drbrain@segment7.net> wrote:
> On Nov 21, 2005, at 10:32 PM, Todd wrote:
>
>> So I decided to try out Ubuntu on a different partition.  I built Ruby
>> 1.8.3, and now in irb I can't hit the up arrow to bring up my last
>> command(s).  Is there a way to set this up?  I'm asking because I'm a
>> terrible typist and require this much-needed tool (crutch).
>
> Sounds like you're missing libreadline

Look in ext/readline/mkmf.log to see why Ruby misses it.

Usually headerfiles are not found. Can't imagine Ubuntu doing something
special with them, tho.

Doing
  require 'readline'
in Ruby may also tell you something extra. On the command line
  ldd /path/to/local/ruby/i?86-linux/readline.so
might help you. Finally, check whether you are running the Ruby you think
you are running,
  type -a ruby
and ruby -v for all of them if it's more than one.

Hth,
Kero.