import java.io.*;

/** * * @author Justin */ public class Main {

private static String fileLines;
private static String fileName;    

public static void main(String[] args) {
    if (args.length < 1) {
        System.out.println("No file name found in command line arguments!!");
        System.exit(1);
    }
    fileName = args[0];
    if (!(new File(fileName)).exists()) {
        System.out.println("File not found!!");
        System.exit(1);
    }

    try {
        FileWriter fileReader = new FileWriter(fileName, true);
        BufferedWriter write2File = new BufferedWriter(fileReader);
        write2File.write("\nfile modified by program");
        write2File.close();

        FileInputStream inPutStream = new FileInputStream(fileName);
        DataInputStream dataStream = new DataInputStream(inPutStream);
        BufferedReader myReader = new BufferedReader(new InputStreamReader(dataStream));
        while ((fileLines = myReader.readLine()) != null) {
            System.out.println(fileLines);
        }
        dataStream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}