.rvmrc file that is a shell script; From Object on Rails

.rvmrc

#!/usr/bin/env bash

# This is an RVM Project .rvmrc file, used to automatically load the ruby
# development environment upon cd'ing into the directory

# First we specify our desired <ruby>[@<gemset>], the @gemset name is optional.
environment_id="ruby-1.9.2-p290@ootw"

#
# Uncomment following line if you want options to be set only for given project.
#
# PROJECT_JRUBY_OPTS=( --1.9 )

#
# First we attempt to load the desired environment directly from the environment
# file. This is very fast and efficient compared to running through the entire
# CLI and selector. If you want feedback on which environment was used then
# insert the word 'use' after --create as this triggers verbose mode.
#
if [[ -d "${rvm_path:-$HOME/.rvm}/environments" \
  && -s "${rvm_path:-$HOME/.rvm}/environments/$environment_id" ]]
then
  \. "${rvm_path:-$HOME/.rvm}/environments/$environment_id"

  if [[ -s "${rvm_path:-$HOME/.rvm}/hooks/after_use" ]]
  then
    . "${rvm_path:-$HOME/.rvm}/hooks/after_use"
  fi
else
  # If the environment file has not yet been created, use the RVM CLI to select.
  if ! rvm --create use  "$environment_id"
  then
    echo "Failed to create RVM environment '${environment_id}'."
    exit 1
  fi
fi

#
# If you use an RVM gemset file to install a list of gems (*.gems), you can have
# it be automatically loaded. Uncomment the following and adjust the filename if
# necessary.
#
# filename=".gems"
# if [[ -s "$filename" ]]
# then
#   rvm gemset import "$filename" | grep -v already | grep -v listed | grep -v complete | sed '/^$/d'
# fi

# If you use bundler, this might be useful to you:
if command -v bundle && [[ -s Gemfile ]]
then
  bundle
fi