Изпълняване на Shell команди от Java код.

String cmd = "ls -al";
  Runtime run = Runtime.getRuntime();
  Process pr = run.exec(cmd);
  pr.waitFor();
  BufferedReader buf = new BufferedReader(new InputStreamReader(pr.getInputStream()));
  String line = "";
  while ((line=buf.readLine())!=null) {
   System.out.println(line);
  }