Code uses java.nio.file.Files to list all files in the current directory. Using Scala JavaConverters we convert the Java iterator to a Scala buffer and the use Process to call unzip on each file.

import scala.collection.JavaConverters._
import scala.sys.process._
import java.nio.file._
val files = Files.list(Paths.get(".")).iterator.asScala
files.foreach { f => s"unzip $f"! }