swift library profile userDefaults

If I use swift playground:
//: Playground - noun: a place where people can play

import UIKit

let userDefaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
userDefaults.setInteger(10, forKey: "age")
userDefaults.setInteger(10, forKey: "age1")
userDefaults.setObject("John", forKey: "name")
userDefaults.setObject("John2", forKey: "name2")
userDefaults.setObject("John3", forKey: "name3")
userDefaults.synchronize()

let Library:String =
    NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.LibraryDirectory, NSSearchPathDomainMask.UserDomainMask, true) [0] as String + "/Preferences"

if I look at the string for the last statement, it's value is:
"/var/folders/hr/6ybn_7091jl7z5_l7f8ym8f00000gn/T/com.apple.dt.Xcode.pg/containers/com.apple.dt.playground.stub.iOS_Simulator.MyPlayground2-B5D7F19D-EACB-4290-BC18-75DF85E15995/Library/Preferences”

It was my understanding that i could do in the terminal open + theAboveString.  This does not work, but I can do a Finder->Go to folder -> ~/Library/Preferences

Then I was suppose to see plist files with keys "age,name, etc" (see above in seeing userDefaults.setxxx).  I can not see the contents of any plist files with this information.  Has this changed with new releases of Xcode?