I decided to use Ruby to make a script for creating a import file from Blosxom to Movable Type. If anyone wants it, you can download the script. My primary reason for using Ruby instead of PHP, is that Ruby comes installed by default on all new OS X (10.2+) installations, but very few people have a command line version of PHP on their computers as I do.
Ruby turned out to be a great choice. I’ll definitly be using it as my filesystem scripting language of choice now. Take a look at the source for my simple import script - that’s so clean and easy to read compared with perl or sh. And yet it is powerful.