# arguments An array that provides access to this program’s command line arguments. ``` static var arguments: [String] { get set } ``` ## Discussion Use `CommandLine.arguments` to access the command line arguments used when executing the current program. The name of the executed program is the first argument. The following example shows a command line executable that squares the integer given as an argument. ``` if CommandLine.arguments.count == 2, let number = Int(CommandLine.arguments[1]) { print("\(number) x \(number) is \(number * number)") } else { print( """ Error: Please provide a number to square. Usage: command """ ) } ``` Running the program results in the following output: ``` $ command 5 5 x 5 is 25 $ command ZZZ Error: Please provide a number to square. Usage: command ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)