How do I use Ruby\'s fileutils to make an alias on Mac\'s filesystem? Symbolic link would work too, either one. Or would I need to use some sort of shell script to do so?
Use FileUtils::symlink:
FileUtils.symlink(src, dest)
To learn how to make an alias via AppleScript, see https://apple.stackexchange.com/questions/51709/can-i-create-a-desktop-shortcut-alias-to-a-folder-from-the-terminal
As a side note: except for the aliases (via AppleScript), Ruby will handle this correctly on any supported file system.