Used to be that Ruby's "rubygems" library had an alias "ubygems" so that when invoking ruby with the -r option (to require a library) you could say "ruby -rubygems". Sadly, they seem to have removed this alias library sometime around Ruby 2.4.

It was removed because rubygems was made to be required by default so it was now useless.

The stdlib still contains `un.rb` though: https://github.com/ruby/ruby/blob/d428d086c23219090d68eb2d02...

Wow, I did not about un.rb. Looks cool though.

A friend created a library called library which was kind of a converse to that (you had to link it with -lrary). It was funny for 30 seconds and then just annoying.

There is also https://github.com/gebi/libowfat