hello world with ansible getting started tutorial

ansible up and Running
ansible playbooks
ansible --version
-- Inventory
testserver ansible_ssh_host=127.0.0.1 ansible_ssh_port=2222
ansible_ssh_private_key_file=/Users/aninath/Documents/junk/vagrant_tut/.vagrant/machines/default/virtualbox/private_key

--running
ansible 127.0.0.1 -i inventory -m ping -u vagrant
ansible 127.0.0.1 -i inventory -a '/bin/echo hello World! from zarigatongy'