Ping&Eject

import std.stdio;
import std.algorithm;
import std.datetime;
import std.path;
import std.process;
import core.thread;
import std.conv;

string currentDateTime() {
  return findSplit(Clock.currTime().toString, ".")[0];
}

enum MAX_ATTEMPTS = 3;
enum SLEEP_TIME = 10;
enum MAX_WAIT_REBOOT_TIME = 300; //5 минут

int main(string[] argv) {
//  argv ~= "192.168.1.43";
  void ShowUsage() {
    auto exeName = baseName(argv[0]);
    writeln("Usage: "~exeName~" <IP-address or DNS-name>\n\rExample: "~exeName~" 192.168.1.23");
  }
  if (argv.length != 2) {
    ShowUsage();
    return 1;
  }
  auto ip = argv[1];
  writeln("Ping: "~ip~" | Started: "~currentDateTime);

  auto attempts = MAX_ATTEMPTS;
  auto attemptsMultiplier = 1;
  auto sleepMultiplier = 1;
  while (true) {
    while (attempts > 0){
      core.thread.Thread.sleep(dur!("seconds")(sleepMultiplier * SLEEP_TIME));
      //посылаем 3 пинга, хотя бы один не прошёл - не доступен
      if ((system("ping -n 1 -w 50 "~ip~" > nul") && system("ping -n 1 -w 50 "~ip~" > nul") && system("ping -n 1 -w 50 "~ip~" > nul")) == 0) {
        writeln(currentDateTime~": ping succeed");
        attempts = MAX_ATTEMPTS;
        attemptsMultiplier = 1;
        sleepMultiplier = 1;
      }
      else {
        attempts -= sleepMultiplier;
        if (attempts < (MAX_ATTEMPTS / attemptsMultiplier)) {
          if (sleepMultiplier == 1) {
            writeln(currentDateTime~": ping failed! Will try "~to!string(attempts)~" more times before eject CD.");
          }
          else {
            writeln(currentDateTime~": timeout expired. Re-ejecting CD and wait for boot longer.");
            attemptsMultiplier++;
            break;
          }
        }
        else {
          writeln(currentDateTime~": waiting for boot. Will re-try in "~to!string(attempts * SLEEP_TIME)~" seconds.");
          sleepMultiplier = 5;
        }
      }
    }
    writeln("Ejecting CD-ROM...");
    system(`powershell $cds = (New-Object -ComObject "WMPlayer.OCX").cdromCollection; for($i=0;$i -lt $cds.Count;$i++) { $cds.Item($i).Eject() }`);
    attempts = attemptsMultiplier * (MAX_WAIT_REBOOT_TIME / SLEEP_TIME); //достаточное количество попыток для запуска компа
  }
  return 0;
}