NSTask Sample for Swift

nstask.swift

import Cocoa
import Foundation

var str = "Hello, playground"

var task:NSTask = NSTask()
var pipe:NSPipe = NSPipe()

task.launchPath = "/bin/ls"
task.arguments = ["-la"]
task.standardOutput = pipe
task.launch()

var handle = pipe.fileHandleForReading
var data = handle.readDataToEndOfFile()
var result_s = NSString(data: data, encoding: NSUTF8StringEncoding)
print(result_s)

buildTask.launch() is not up to date anymore. Since High Sierra, Process().lauch() is deprecated. Use Process().run instead and catch the error that may be thrown.
See Apple Developer Documentation for launch()

This Tutorial goes a bit more into detail regarding NSTasks.