I seem to have multiple versions of ruby on my mac. Is it safe to clean up and remove some?

In a tutorial project I have started, when i type 'rake db:create' or 'where rake' i get a 'rake aborted! stack level too deep' error.

If i type 'where ruby' in my snow leopard terminal, I get the following:

/Users/xxx/.rvm/rubies/ruby-1.9.2-p180/bin/ruby
/Users/xxx/.rvm/bin/ruby
/开发者_Go百科usr/bin/ruby
/usr/local/bin/ruby

The usr/bin/ruby is an alias that points to: /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby

As I only have one project and it uses the rvm ruby, which versions of ruby is it safe for me to delete and what's the best way to go about it? Which files and folders should go?

And where should i check for correct paths? I have the following line in .zshrc:

[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"

Is that all that is needed?

The first two might actually be the same since /Users/xxx/.rvm/bin/ruby is a symlink to rvm's default Ruby. The third one is the system Ruby which you probably want to leave alone. The one in /usr/local/bin should be completely save to remove.