Enable Tab Completion in IRB (Ubuntu)

I've wanted to add tab completion to IRB for a while, but when I had tried a tutorial that I found on the Web a few weeks ago, it didn't work for me.

I just found a great Flash video on how to enable tab completion in IRB. I was glad to see that the author of the tutorial was also using Ubuntu, and that the solution is very fast and easy.

Basically, just create a file in your home directory called .irbrc. Add the following two lines and save it:

require 'irb/completion'
IRB.conf[:PROMPT_MODE] = :SIMPLE

The first line enables IRB completion, and the second removes the extra text in the irb prompt.

The irb prompt before:

The irb prompt after, looking much better:

To use the tab completion in irb, press TAB twice. Irb will then give you a list of possible completions like this: