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ri

/usr/bin/ri
Ruby api reference front end

ri is a part of Ruby. ri is a command-line front end for the Ruby API reference.

source: man
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ri
Ruby API reference front end

ri is a command-line front end for the Ruby API reference. ri provides search and read the API reference for classes and methods.

The binary is a part of Ruby public framework.

source: man