code: public static void main(String args[]){
          if (args.length != 4){            
              displayHelp();
              System.exit(1);
          }
          
          try{
              JVnSenSegmenter senSegmenter = new JVnSenSegmenter();
              senSegmenter.init(args[1]);
              
              String option = args[2];
              if (option.equalsIgnoreCase("-inputfile"))
              {
                 senSegmentFile(args[3], args[3] + ".sent", senSegmenter);
              }
              
              else if (option.equalsIgnoreCase("-inputdir")){
                  //segment only files ends with .txt
                  File inputDir = new File(args[3]);
                  File [] childrent = inputDir.listFiles(new FilenameFilter() {
                      public boolean accept(File dir, String name) {
                          return name.endsWith(".txt");
                      }
                  });
                  
                  for (int i = 0; i <childrent.length; ++i)
                  {
                      System.out.println("Segmenting sentences in " + childrent[i]);
                      senSegmentFile(childrent[i].getPath(), childrent[i].getPath() + ".sent", senSegmenter);
                  }                
              }
              else 
                  displayHelp();
          }
          catch (Exception e)
          {            
              System.out.println(e.getMessage());
              return;
          }
          
      }
docs: main method of JVnSenSegmenter
  to use this tool from command line.
  
  @param args the arguments