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To run Swift code that is embedded into a single line terminal command, follow these steps:

1. Open Terminal on your Mac.

2. Type the following command to launch the Swift REPL (Read-Eval-Print Loop):

   
   swift
   
   

3. Write the Swift code that you want to run on a single line. For example:

   print("Hello, World!")
   

4. Press the Enter key to execute the code.

   $ swift
   Welcome to Apple Swift version 4.0.3 (swiftlang-900.0.74.1 clang-900.0.39.2). Type :help for assistance.
   1> print("Hello, World!")
   Hello, World!
   1>
   

   The code will execute and the output will be displayed in the Terminal.

Note: If your Swift code requires multiple lines or needs to import external libraries, it may be more appropriate to create a Swift file and run it from the command line using the swift command.