Hi.
Looks like you're missing all of the necessary parameters.
/install.sh [-s] -a=<account_name>@<account_access_key> [-e <php_ext_dir>] [-i <php_ini_dir>] [-p <php_binary_dir>] [-v <php_version>] <controller-host> <controller-port> <app_name> <tier_name> <node_name>
https://docs.appdynamics.com/display/PRO41/Install+the+PHP+Agent+using+a+Shell+Script