bundle platform [--ruby]
platform will display information from your Gemfile, Gemfile.lock, and Ruby
VM about your platform.
For instance, using this Gemfile(5):
source "https://rubygems.org"
ruby "1.9.3"
gem "rack"
If you run bundle platform on Ruby 1.9.3, it will display the following output:
Your platform is: x86_64-linux
Your app has gems that work on these platforms:
* ruby
Your Gemfile specifies a Ruby version requirement:
* ruby 1.9.3
Your current platform satisfies the Ruby version requirement.
platform will list all the platforms in your Gemfile.lock as well as the
ruby directive if applicable from your Gemfile(5). It will also let you know
if the ruby directive requirement has been met. If ruby directive doesn't
match the running Ruby VM, it will tell you what part does not.
--ruby: It will just display the ruby directive information, so you don't have to parse it from the Gemfile(5).