funWithFlags.scala

import com.twitter.app._
import java.net.InetSocketAddress

object Main extends App {
  // set default values for this flag, if it isn't passed in at command line
  val memcachedF = flag("memcached", Seq(new InetSocketAddress(0)), "memcached addresses")
  
  // print out the current value of the memcached flag (at this point, it's just the default value)
  println(s"1. memcacheds from defaults: ${memcachedF()}")
  
  /** 
   * the method that runs when we call "run"
   * it will pass the cli args through the initialized parser and update the flag values
   */
  def main : Unit = 
    println(s"2. memcacheds from args ${memcachedF()}")
}

> run -memcached=localhost:11211,10.2.2.1:11211

1. memcacheds from defaults: List(0.0.0.0/0.0.0.0:0)
2. memcacheds from args ArraySeq(localhost/127.0.0.1:11211, /10.2.2.1:11211)