How to create DSL in Scala for command lines with minimum boilerplate

ShellSupport.scala

package lib
import sys.process.{Process, stringToProcess}

class Shell {
  var elems = Vector[String]()
  var cwd = "/tmp"

  def >(str: String) = elems :+= str

  def run() = elems.map( cmd => {
    val CdPattern = "cd (.*)".r
    cmd match {
      case CdPattern(dir) =>
        cwd = dir
        "directory changed to " + dir
      case anyCmd => Process(anyCmd,new java.io.File(cwd))!!
    }
  }
  )
}


trait ShellSupport extends DelayedInit{
  var result = Vector[String]()

  val $ = new Shell()

  def delayedInit(x: => Unit) {
    x
    result = $.run()
  }

}

SomeScript.scala

package scripting

import lib.ShellSupport


class Turismo extends ShellSupport {

  $> "rm -rf /tmp/scripting"
  $> "mkdir /tmp/scripting"
  $> "cd /tmp/scripting"
  $> "mkdir oops"

}

based on SO question: http://stackoverflow.com/questions/10708136/how-to-create-dsl-in-scala-for-command-lines-with-minimum-extra-boilerplate