So I just installed ruby 1.9.1 through MacPorts and wanted to easily migrate my rubygems across from 1.8 to see which ones would fail to install.

So, I keep having to reinstall mysql5 and rubygems from time to time for various reasons. I always install mysql5 through MacPorts as a dependency for the php5 port (along with various other bits for the LA*P stack).

I just came to move some ruby scripts onto my mac mini, and to do so I needed to install a couple of gems. Now I realised I hadn't installed or updated rubygems on the machine for a while, so I figured it was best to update gem before installing the gems I wanted. Easier said than done.