Once you’ve downloaded a Mac OS Installer, you know it takes a long time. Multiply that time and the half-hour installation by many workstations, and you have potentially days of work to upgrade them all.
We can slash that time by reusing the installer.
ssh into a machine with the package, and
ls /Applications/. We should see our directory, named
Install\ OS\ X\ El\ Capitan.app/ (insert your OS version name).
scp -r that directory to your local
/Applications/, which should take a few minutes.
Back on your machine, find ‘Install OS El Capitan’ with the Finder, and follow the installation steps.
h/t Dillon HaferTweet