uninstall_gem

# File lib/rubygems/commands/uninstall_command.rb, line 169
  def uninstall_gem(gem_name)
    uninstall(gem_name)
  rescue Gem::InstallError
    nil
  rescue Gem::GemNotInHomeException => e
    spec = e.spec
    alert("In order to remove #{spec.name}, please execute:\n" +
          "\tgem uninstall #{spec.name} --install-dir=#{spec.installation_path}")
  rescue Gem::UninstallError => e
    spec = e.spec
    alert_error("Error: unable to successfully uninstall '#{spec.name}' which is " +
          "located at '#{spec.full_gem_path}'. This is most likely because" +
          "the current user does not have the appropriate permissions")
    terminate_interaction 1
  end