execute

# File lib/rubygems/commands/signout_command.rb, line 19
  def execute
    credentials_path = Gem.configuration.credentials_path

    if !File.exist?(credentials_path) then
      alert_error 'You are not currently signed in.'
    elsif !File.writable?(credentials_path) then
      alert_error "File '#{Gem.configuration.credentials_path}' is read-only."                   ' Please make sure it is writable.'
    else
      Gem.configuration.unset_api_key!
      say 'You have successfully signed out from all sessions.'
    end
  end