Nothing known about…. when trying ri String#upcase Ruby
Did you generate the docs? rvm docs generate https://rvm.io/rubies/docs/
ri
Why does my Ruby ‘ri’ tool not return results in command prompt? [duplicate]
Although this question is old, nobody has yet provided a proper solution. I just ran into the same issue, and found the solution: If you are using RVM: rvm docs generate-ri # <- Just the ri docs, much faster rvm docs generate # <- Everything (rdoc + ri) More info on managing RVM docs here: … Read more
What is the difference between ri and rdoc
RDoc [..] is the embedded documentation generator for the Ruby programming language. [..] RDoc is included as part of the Ruby core distribution. RDoc also provides the engine for creating Ruby ri data files. ri is (more or less) Ruby’s version of man pages, serving up API information from the command line. From: http://en.wikipedia.org/wiki/RDoc