ProcessBuilder未输出正确的输出

private void printNumberOfRecords(){
   try {
      ProcessBuilder builder = new ProcessBuilder(
         "/bin/sh", "-c",
         "grep", "\"target-word\"", localFileName, "|", "wc", "-l");
      Process p = builder.start();
      p.waitFor();
      BufferedReader br=new BufferedReader(
         new InputStreamReader(
            p.getInputStream()));
      String line;
      while(( line = br.readLine()) != null ) {
         System.out.println(line);
      }
   }
   catch( Exception e ) {
      e.printStackTrace();
   }
}