macos - Xcode - Install additional required components using command line

Question

I recently got a used Mac with Mountain Lion on it. I don't know of the admin password or anything, but I do know how to run a command line.

So here's what I am stuck on:

When I click install, it asks me for my username and password (which I don't know).

I want to install this via single-user mode (Cmd+S on Startup), which I accepted the license using it.

Do you guys know how I could achieve this?

Answer 1

At least on Xcode 9.2, you could use:

sudo xcodebuild -runFirstLaunch

to accept the agreement and install additional components.