Today I Learned

hashrocket A Hashrocket project

Reuse a Mac OS Installer

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\ (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 Hafer