How do I install the Ruby ri documentation?

Question

I\'ve recently installed Ruby 1.9.1 on Windows 7, and apparently it doesn\'t come with the standard ri documentation. So when I do \'ri Array\', I get:

C:\\         


        

Answer 1

You might run into this issue under Docker. The official docker images come with no documentation, and apparently disable installing gem documentation.

If image's and system ruby versions match (specifically, RbConfig::CONFIG["ruby_version"], which is e.g. 2.6.0 for ruby-2.6.1), you can:

# apk add ruby-doc
# cp -r /usr/share/ri /usr/local/share/ri