CGSession is a command-line utility available on Windows that allows users to switch between user sessions. It is often used in environments where multiple users need to access the same computer without logging off the current user. However, this specific utility does not exist in the macOS environment. Instead, macOS offers alternative methods to achieve similar functionality, such as using Fast User Switching and the loginwindow command.

Fast User Switching is a built-in feature in macOS that allows multiple users to be logged in simultaneously, enabling easy switching between user accounts without logging off. For more advanced command-line control, the loginwindow command can be used to switch user sessions. This article will guide you through using these alternatives on macOS.

Examples:

1. Enabling Fast User Switching:

   To enable Fast User Switching on macOS, follow these steps:

   1. Open System Preferences.
   2. Go to Users & Groups.
   3. Click the Login Options button at the bottom left.
   4. Check the box next to Show fast user switching menu as and select your preferred menu style.

   Now, you can switch users from the menu bar without logging off.

2. Switching Users via Command Line:

   While macOS does not have a direct equivalent to CGSession, you can use the loginwindow command to log out the current user, which allows another user to log in. Here’s how you can do it:

   sudo killall -HUP loginwindow

   This command will log out the current user and return to the login window, where another user can log in. Note that this will close all applications and unsaved work will be lost.

3. Using AppleScript for User Switching:

   For a more automated approach, you can use AppleScript to switch users. Here is an example script that you can run from the Script Editor or save as an application:

   tell application "System Events"
      key code 53 using {command down, shift down}
   end tell

   This script simulates the keyboard shortcut for switching users (Command + Shift + Q), which brings up the user switching dialog.