Rake

  RVM allows you to run rake tasks across multiple ruby versions, for example:

    ∴ rvm 1.8.6,1.9.1 rake spec

JSON Summary

  Adding a --json flag prior to the word 'rake' and a JSON summary will be printed out at the end of the run.

YAML Summary

  Adding a --yaml flag prior to the word 'rake' and a YAML summary will be printed out at the end of the run.