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Ruby is...

A dynamic, open source programming language with a focus on simplicity and productivity.
It has an elegant syntax that is natural to read and easy to write.

RobyGems@Universe~ $ irb
irb(main):001:0> (1..5) === 3
=> true
irb(main):002:0> (1..5) === 7
=> false
irb(main):003:0> exit
RobyGems@Universe~ $

You can read up more on Interactive Ruby shell or irb here

If you have Ruby installed you can run:

man irb