import java.io.FileInputStream;

import java.io.PrintStream;

import java.util.Date;

import java.io.IOException;

public class RedirectIODemo{

public static void main(String[] args) throws IOException{

if(args.length!=3){

System.err.println("usage: java RedirectIODemo inputSource outDest errDest.");

return;

}

System.setIn(new FileInputStream(args[0]));

System.setOut(new PrintStream(args[1]));

System.setErr(new PrintStream(args[2]));

int ch;

while((ch=System.in.read())!=-1){

//System.out.print((char)ch); // with charset problem

System.out.write(ch);

}

System.err.println("This is error log.");

System.err.println();

System.err.println("Permission Denied." + new Date(System.currentTimeMillis()));

}

}