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I know it should never be done, but I accidentally removed the folder /usr/bin/ruby from my Mac OS X. With that I lost all pre-installed ruby files. Now when trying to install Homebrew, for instance, I get the error:
-bash: /usr/bin/ruby: No such file or directory
How can I get pre-installed ruby back to /usr/bin?
Just install rvm and get most updated ruby. Even because the one shipped with OS X is rather obsolete (it should be 1.8.7 if I remember correctly).
There’s no need to reinstall the bundled one when you can install an updated version in just a couple of minutes.