// file copy program, copying the first argument to the second

// the third argument, if `a', means append; `w' or lack of a third
// argument, means write-over

// reads in byte-by-byte; more advanced forms may be more efficient

import java.io.*;

public class CpBytes 

{
   public static void main (String Arg[]) throws FileNotFoundException,
      IOException
	
   {  FileInputStream F1 = new FileInputStream(Arg[0]);
      FileOutputStream F2;
      if (Arg.length == 2 || Arg[2].equals("w"))
         F2 = new FileOutputStream(Arg[1]);
      else
         F2 = new FileOutputStream(Arg[1],true);
      int ByteValue;  // has range 0 to 255, so it works for any type
                      // of data
      while (true)  {
         ByteValue = F1.read();
         if (ByteValue == -1)  // end-of-file encountered
            break;
         else F2.write(ByteValue);
      }
      F1.close();
      F2.close();
   }
}