.NET OS

using Sys = Cosmos.System;
using Cosmos.HAL;
using Cosmos.System.Graphics;
using System.IO;
using Cosmos.System.FileSystem;

namespace CosmosKernel1
{
    public class Kernel : Sys.Kernel
    {

        protected override void BeforeRun()
        {
            Console.WriteLine("Initializing file system...");
            var fs = new Sys.FileSystem.CosmosVFS(); //virtual file system
            Sys.FileSystem.VFS.VFSManager.RegisterVFS(fs);
            Console.WriteLine("Cosmos booted successfully."); //Type a line of text to get it echoed back.
            //new PIT().Wait(10000);
            Console.Clear();
            Console.WriteLine("   #|   #  #####  ######   #####  #####");
            Console.WriteLine("   ##   #  #|       #|     #|  #  #|");
            Console.WriteLine("   #|#  #  #####    #|     #|  #  #####");
            Console.WriteLine("   #| # #  #|       #|     #|  #     |#");
            Console.WriteLine(".: #|  ##  #####    #|     #####  #####");
            Console.WriteLine();
            Console.WriteLine($".NET OS 1.0 ({Cosmos.Core.CPU.GetAmountOfRAM()} RAM)");
        }

        protected override void Run()
        {
            Console.Write(".: ");
            var input = Console.ReadLine().Split();
            //Console.Write("Text typed: ");
            //Console.WriteLine(input);
            switch (input[0])
            {
                case "shutdown":
                    Cosmos.System.Power.Shutdown();
                    break;
                case "reboot":
                    Cosmos.System.Power.Reboot();
                    break;
                case "clear":
                    Console.Clear();
                    break;
                case "echo":
                    try
                    {
                        Console.WriteLine(String.Join(" ", input).Replace(input[0], ""));
                    }
                    catch (ArgumentOutOfRangeException)
                    {
                        Console.WriteLine(" ");
                    }
                    break;
                /*case "sleep":
                   new PIT().Wait(UInt32.Parse(input[1])*1000);
                    break;*/
                case "ls":
                    string path = input[1];
                    foreach (var i in Directory.GetFiles(path))
                    {
                        Console.WriteLine(i);
                    }
                    foreach (var i in Directory.GetDirectories(path))
                    {
                        Console.WriteLine(i);
                    }
                    break;
                case "edit":
                    using (FileStream fstream = new FileStream($"{input[1]}", FileMode.OpenOrCreate))
                    {
                        // преобразуем строку в байты
                        byte[] array = System.Text.Encoding.Default.GetBytes(Console.ReadLine());
                        // запись массива байтов в файл
                        fstream.Write(array, 0, array.Length);
                    }
                    break;
                case "cat":
                    //using (FileStream fstream = File.OpenRead($"{input[1]}"))
                    //{
                    //    // преобразуем строку в байты
                    //    byte[] array = new byte[fstream.Length];
                    //    // считываем данные
                    //    fstream.Read(array, 0, array.Length);
                    //    // декодируем байты в строку
                    //    string textFromFile = System.Text.Encoding.Default.GetString(array);
                    //    Console.WriteLine(textFromFile);
                    //}
                    using (StreamReader sr = new StreamReader(input[1], System.Text.Encoding.Default))
                    {
                        string line;
                        while ((line = sr.ReadLine()) != null)
                        {
                            Console.WriteLine(line);
                        }
                    }
                    break;

                case "ironinfo":
                    //Console.WriteLine("---------- Информация о камне -----------");
                    Console.WriteLine("---------- CPU info-----------");
                    Console.WriteLine($"Name: {Cosmos.Core.ProcessorInformation.GetVendorName()}");
                    //Console.WriteLine($"NumberOfCores: {Cosmos.Core.ProcessorInformation.GetCycleCount()}");
                    Console.WriteLine($"NumberOfCores: {Cosmos.Core.CPU.GetEndOfKernel()}");
                    break;
                case "piano":
                    ConsoleKeyInfo key;
                    do
                    {
                        Console.Clear();
                        Console.WriteLine("Piano v1.0\nPress 'Esc' to exit the program.\n");
                        Console.WriteLine("Press the Q-U button:");
                        key = Console.ReadKey();
                        switch (key.Key)
                        {
                            case ConsoleKey.Q:
                                PCSpeaker.Beep(523);
                                Console.Clear();
                                break;
                            case ConsoleKey.W:
                                PCSpeaker.Beep(587);
                                Console.Clear();
                                break;
                            case ConsoleKey.E:
                              PCSpeaker.Beep(659);
                                Console.Clear();
                                break;
                            case ConsoleKey.R:
                              PCSpeaker.Beep(698);
                                Console.Clear();
                                break;
                            case ConsoleKey.T:
                              PCSpeaker.Beep(784);
                                Console.Clear();
                                break;
                            case ConsoleKey.Y:
                              PCSpeaker.Beep(880);
                                Console.Clear();
                                break;
                            case ConsoleKey.U:
                              PCSpeaker.Beep(987);
                                Console.Clear();
                                break;
                        }
                    }
                    while (key.Key != ConsoleKey.Escape); // по нажатию на Escape завершаем цикл
                    break;
                case "date":
                    //Console.WriteLine($"{RTC.DayOfTheWeek} {RTC.Month} {RTC.DayOfTheMonth} {RTC.Hour}:{RTC.Minute}:{RTC.Second} {RTC.Year} {RTC.Century}"); //Real Time Clock
                    Console.WriteLine(DateTime.Now);
                    break;
                case "df":
                    foreach (var i in Sys.FileSystem.VFS.VFSManager.GetLogicalDrives())
                    {
                        Console.WriteLine(i);
                    }
                    break;
                default:
                    if (input[0] != "")
                        Console.WriteLine($"{input[0]}: command not found");
                    break;
            }
        }
    }
}