ri software package provides Ruby Interactive reference, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install ri
ri is installed in your system.
Make ensure the ri package were installed using the commands given below,
$ sudo dpkg-query -l | grep ri *
You will get with ri package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Interpreters |
| Package | ri |
| Version | 1:1.9.3.4 |
| Description | Ruby Interactive reference |
| Sub Section | Interpreters |
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