// this program is to simulate the behavior of the ls command on linux/unix operate system.


import java.io.File;
import java.util.Date;

public class Ls {
    public static void printOne(File f) {
      if (f.exists()) {
          System.out.print(f.canRead() ? "r" : "-");
          System.out.print(f.canWrite() ? "w" : "-");
          System.out.print(f.isDirectory() ? "d" : "-");
          System.out.print('\t');

          System.out.print(f.length());
          System.out.print('\t');

          System.out.print(new Date(f.lastModified()));
          System.out.print('\t');
      } else {
          System.out.print("\t\t\t\t\t");
      }
      System.out.println(f.getName());
    }
    public static void main(String[] args) {
      if (args.length != 1) {
          System.err.println("Usage: java Ls <filepath>");
          System.exit(-1);
      }
      File f1 = new File(args[0]);
      String[] ls;
      int i;
      for (ls = f1.list(), i = 0; 
           ls != null && i < ls.length;
           printOne(new File(f1, ls[i])), i++);
    }
}