scala /path/to/file/file.scala

scala ./to./file/file.scala

import java.io.File

printf("[%s]n",new File(getScriptName).getCanonicalPath)
System.exit(0)

def getScriptName:String = {
  // this approach works on the sun jvm:
  val jcmd = System.getProperty("sun.java.command","")
  jcmd.split("""s+""").toList.reverse.head match {
  case name if new File(name).exists => name
  case _ =>
    // for this to work, you need to set -Dscala.script.name at script launch
    System.getProperty("scala.script.name","") match {
    case name if new File(name).exists => name
    case _ =>
      // last resort: derive script basename from stackdump
      val basename = {
        val filenames = new RuntimeException("").getStackTrace.map { it
          => it.getFileName
        }
        filenames.indexOf("NativeMethodAccessorImpl.java") match {
          case -1 =>  filenames.reverse.head
          case num => filenames(num - 1)
        }
      }
      // then search the system PATH for the script file
      import scala.collection.JavaConversions._
      val sep = System.getProperty("path.separator")
      val path = System.getenv("PATH").split(sep)
      path.map(new File(_,basename)).find( _.exists ) match {
        case Some(scriptfile) => scriptfile.getCanonicalPath
        case _ => basename // better than nothing
      }
    }
  }
}

#!/usr/bin/env sh
for SCRIPT_NAME; do true ; done # set SCRIPT_NAME to the last argument
JAVA_OPTS="$JAVA_OPTS -Dscala.script.name=${SCRIPT_NAME}"
$SCALA_HOME/bin/scala "$@"

#!/usr/bin/env scala
!#
printf("%sn",System.getProperty("scala.script.name"))

#!/bin/sh
export SCRIPT_PATH=$(readlink -f "$0") && exec scala "$0" "$@"
!#

val scriptPath = System.getenv("SCRIPT_PATH")

import java.net.URL

object LocationTest extends App {
  val classDirURL = LocationTest.getClass.getResource("LocationTest.class")
  val classDirPath = classDirURL.getPath.replaceAll("%20", " ")
  println(classDirPath)
}

/Users/connor/desktop/LocationTest.class

scala -DPARAM_DIR=tmp Foo

object Foo extends App {
  val dir = System.getProperty ("PARAM_DIR")
  println ("Dir: " + dir)
}

/path/to/file/file.scala