.powrc for pow & rvm http://matt.coneybeare.me/getting-pow-to-use-rvms-ruby-version-on-mavericks/

.bashrc

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"
PATH=$PATH:$HOME/.rvm/bin # Add RVM to PATH for scripting

.powrc

if [ -f "$rvm_path/scripts/rvm" ] && [ -f ".ruby-version" ]; then
  source "$rvm_path/scripts/rvm"
  if [ -f ".ruby-gemset" ]; then
    rvm use `cat .ruby-version`@`cat .ruby-gemset`
  else
    rvm use `cat .ruby-version`
  fi
fi