How to keep ruby on rails script running persistently within rails app on ec2 -

How to keep ruby on rails script running persistently within rails app on ec2 -

i have deployed ruby on rails 3 version application on ec2 using passenger standalone version. in application have mailman script checks emails every 60 seconds & add together email contents in rails database. whenever run script "script/mailman_server" on ec2 ami fetches emails designated email address.i want mailman script should persistently fetch emails out manual intervention i.e don't want run script manually each time emails. handled in heroku not sure how works on ec2..any help!!! :)

ruby ruby-on-rails-3 amazon-ec2 ec2-ami