Building and Shipping Mac and iOS Apps Without Ever Opening Xcode

# Summary Developers can build and ship Mac and iOS apps without opening Xcode by using command-line tools like xcodebuild, notarytool, and devicectl that are included within Xcode.app. After a one-time setup involving Apple ID sign-in and certificate creation, the entire build, signing, notarization, and deployment process can be automated through shell scripts, eliminating the need to use Xcode's GUI. XcodeGen is used to automatically generate and manage Xcode projects from configuration files, enabling a fully headless development workflow.