How to update macOS using terminal

You could open the app with a similar terminal command to the below, but it would just open the installation screens (same as opening it through Spotlight or finding and clicking on it)-

open -a "Install macOS Ventura.app"

Are you having issues that cause you to use Terminal?

softwareupdate --fetch-full-installer --full-installer-version 13.0

It doesn’t install, but downloads the installer.

The installer will show up in your applications folder. If it doesn’t start on its own, run it from there.

If you want it to install from the shell, I don’t know if that is possible.