Completely new to Macs here, but I am trying to figure out how to create a startup item for all users that will launch a shell script at login. From what I understand... I need to use launchd to create a launch agent by placing a plist file into the /Library/LaunchAgents directory - but when I do this the script is not executed (+x has been set on the script) at login. I am also using el capitan - which I keep finding out has a bunch of things disabled in it. Am I even going the right direction with this?