^ add on to that post.

I know that I can do my Ruby commands in irb and that "irb(main) :001 
:0>" is not some form of error. I mean is there a way to get an editor 
similar to this?

http://i47.tinypic.com/2a78wmo.png

Because the guide is basing it around an editor/program from Ruby 
similar to that.

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