A quick and dirty solution to run my specs through multiple ruby versions.

multispec.sh

# Poor man's multiruby, a wrapper bash function/script around rvm. This is
# used to run all the specs through all the supported versions of ruby.
#
# Requires that all the rubies listed below are installed via rvm, and rvm to
# be sourced in the environment.
#
#   rvm install ${version};
#
# To install the required gems, run the following:
# 
#   gem install rspec builder json nokogiri;

multispec() {
  versions=('1.8.6' '1.8.7' '1.9.1' '1.9.2')

  echo "Running specs for ${#versions[@]} ruby versions"
  echo "------------------------------------------------------------"
  for version in ${versions[@]}
  do
    rvm ${version}
    echo `ruby --version`
    time ./spec-one ${version:0:3} > ${version}.run 2> ${version}.run

    echo
    tail -n 1 ${version}.run
    echo "------------------------------------------------------------"
  done
}

multispec