arguments

Declaration

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 <number>
      """
    )
}

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 <number>