> Looks like a readline problem. What OS/Ruby version are you using?
> (try: ruby -v).

mond:~ # ruby -v
ruby 1.8.0 (2003-08-04) [i686-linux]
mond:~ # irb -v
irb 0.9(02/07/03)
mond:~ #

mond:~ # uname
Linux
mond:~ # uname -r
2.4.21-99-default

SuSE 9.0

> If this is indeed a readline problem, you may need to enable readline
> and recompile (assuming you're on *nix). It's been a while for me, so
> maybe someone else here can help more. 

I will try to get the source and recompile