I'm a beginner programmer going through the railstutorial by michael hartl, and notice that the process for using gems in the application is through adding it to the gemfile, and then doing a:

$ bundle install

Any reason why one wouldn't just do a:

$ [sudo] gem install [the_gem]

and then just add it to the Gem file? I know this was somewhat the process back in rails 2.

Thanks!

ruby-on-rails rubygems bundler railstutorial.org
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