DouKaku?

import    scala.collection.jcl.Conversions

object PrintEnv {
    def printEnv:Unit = {
        Conversions.convertMap(System.getenv).keys.toList.sort { (a,b) => a < b }.foreach { k => printEnv(k) }
    }
    def printEnv(key:String):Unit = {
        Console.printf("%s:\t%s\n", key, System.getenv(key))
    }
    def main(args:Array[String]):Unit = {
        PrintEnv.printEnv
    }
}