How To Add Gem To Gemfile With Commandline
How to Add a Gem to your Gemfile from Command Line#
Many Package managers like composer and npm automatically add packages to their respective package files (composer.json, package.json)
composer require phpunit
npm install grunt-cli
However the gem and bundle utilities do not.
Thankfully there is a gem to do this created by Dru
gem install gemrat
gemrat mysql
Source: Stackoverflow