Mac software update validating packages
Creating a Developer ID-signed app or installer package is a multistep process.
$ sudo softwareupdate -i -a Password: Software Update Tool Copyright 2002-2009 Apple Checking packages…
Installing Waiting for other installations to complete…
You have installed one or more updates that requires that you restart your computer.
In some cases, you may want to distribute an app outside the Mac App Store.
This allows you to use a single command to tell Mac Ports to automatically download, compile, and install applications and libraries.