Cache Your `rbenv` and `ruby-build` downloads

If you hate the way ruby-build is always re-downloading the installer for yaml-0.1.4 (or worse yet massive downloads for ruby-1.9.3-p429.tar.gz), you should enable the download cache. To cache rbenv downloads, all you have to do is create a ~/.rbenv/cache directory.

% mkdir `rbenv root`/cache

I found this little nugget of info when perusing the documentations for ruby-build. I'm not sure why this feature isn't enabled by default?