description

# File lib/rubygems/commands/build_command.rb, line 27
  def description # :nodoc:
    The build command allows you to create a gem from a ruby gemspec.The best way to build a gem is to use a Rakefile and the Gem::PackageTaskwhich ships with RubyGems.The gemspec can either be created by hand or extracted from an existing gemwith gem spec:  $ gem unpack my_gem-1.0.gem  Unpacked gem: '.../my_gem-1.0'  $ gem spec my_gem-1.0.gem --ruby > my_gem-1.0/my_gem-1.0.gemspec  $ cd my_gem-1.0  [edit gem contents]  $ gem build my_gem-1.0.gemspecGems can be saved to a specified filename with the output option:  $ gem build my_gem-1.0.gemspec --output=release.gem
  end