How do you access command line arguments in Swift?

Update 01/17/17: Updated the example for Swift 3. Process has been renamed to CommandLine.

Update 09/30/2015: Updated the example to work in Swift 2.

It's actually possible to do this without Foundation or C_ARGV and C_ARGC.

The Swift standard library contains a struct CommandLine which has a collection of Strings called arguments. So you could switch on arguments like this:

for argument in CommandLine.arguments {    switch argument {    case "arg1":        print("first argument")    case "arg2":        print("second argument")    default:        print("an argument")    }}

In Swift 3 use CommandLine enum instead of Process

So:

let arguments = CommandLine.arguments

Use the top level constants C_ARGC and C_ARGV.

for i in 1..C_ARGC {    let index = Int(i);    let arg = String.fromCString(C_ARGV[index])    switch arg {    case "this":        println("this yo");    case "that":        println("that yo")    default:        println("dunno bro")    }}

Note that I'm using the range of 1..C_ARGC because the first element of the C_ARGV "array" is the application's path.

The C_ARGV variable is not actually an array but is sub-scriptable like an array.