Prevent output of command triggered

gistfile1.rb

def self.preventOutput(msg)    
  exeption = false    
  # Prevent block from outputting anything    
  original_stdout = $stdout   
  $stdout = fake = StringIO.new   
  begin   
    # Peform the action   
    yield if block_given?   
  rescue Exception => e   
    exeption = true   
  ensure    
    $stdout = original_stdout   
    if exeption   
      puts msg unless msg.empty?    
    else    
      puts fake.string    
    end   
  end   
end