gistfile1.txt

Build a host file
http://docs.ansible.com/ansible/intro_inventory.html

Create a play:
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- name: Transfer and execute a script.    <--- name of the play
  hosts: all                              <--- which servesr to run this one, in this case, all of them
  tasks:                                  <--- start to define the jobs to do
     - name: Copy and Execute the script  <--- Name the first task
       script: /home/user/userScript.sh   <--- http://docs.ansible.com/ansible/script_module.html
----------------------------------------------

and run it;
ansible-playbook -i hosts site.yml        <-- Run the play 'site.yml' and use the file called hosts which lists the servers