The cd command changes directory to one of the hidden folders. In the Terminal window, type these two commands, pressing Return after each one: cd /usr/bin Open Terminal: In Finder, double-click Applications/Utilities/Terminal.app, or press Command-Space to activate Spotlight, and start typing Terminal until the app becomes selectable. These commands are executable files stored in secret folders, hidden deep in your Mac’s file system, but now you’re going to find them. You’ve already used a sequence of commands like this in Chapter 1, “Designing the Data Model”, where you formatted the downloaded JSON to make it easier to read. These commands are mostly small, single-purpose utilities you can chain together, if needed. Unix has an extensive set of commands you can run from the command line. MacOS, and its predecessor OS X, are built on top of Unix. Creating a graphical user interface will make it much easier to use. This is a powerful tool, but it’s difficult to remember the syntax. In the app, you’ll use a Terminal command called sips, which stands for scriptable image processing system. You’ll learn more about using Terminal and how to invoke Terminal commands using Swift. You’ll dive deep into your Mac’s system and learn about the command line utilities that are part of macOS. In this section, you’re going to create another windowed app, but with a different purpose. So far, you’ve created three different Mac apps: a windowed app, a menu bar app and a document-based app. Working with Timers, Alerts & Notifications 7.2 Converting the App into a Menu Bar App.Section II: Building a Menu Bar App Section 2: 3 chapters Section I: Your First App: On This Day Section 1: 6 chapters
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