遅ればせながらRVMを導入し、Ruby1.9.xを導入したら、「invalid multibyte char (US-ASCII)」というエラーが出た。 So Ruby 1.9 rejects to parse any file with non-ASCII characters if you don’t specify the encoding. You can do so by adding a Ruby comment at the top of the file: # encoding: utf-8 This tells the Ruby parser to interpret the file content using UTF-8 encoding. Of course, you need to specify the correct encoding (meaningly t