using System;
using Con = System.Console;
using System.IO;

public class FileHandler {

  public static void Main(string [] args) {
    string file = "";

    try {
      file = args[0];
    } catch (System.IndexOutOfRangeException) {
      Con.WriteLine("Bitte Dateinamen angeben.");
      Environment.Exit(1);
    }

    if (File.Exists(file)) {
      Con.WriteLine("Datei existiert: " + file);
    } else {
      using (TextWriter writer = File.CreateText(file)) {
	writer.WriteLine("DotNet auf Linux!");
      }
    }
    using (TextReader reader = File.OpenText(file)) {
      Con.WriteLine("\n" + reader.ReadToEnd());	
    }
  }
}