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Even if you have installed ruby, typing irb in the terminal / konsole / xterm /gnome-terminal will NOT work. The irb error output will be irb: command not found.
This is due to versioning available in irb (interactive ruby). Eventhough you have installed only irb 1.8 or irb 1.9 just typing irb will not work. Use irb+<Ver> like irb1.9 to start irb.
