Listing 1: DellSerial.js

var SCRIPT_NAME = "DellSerial.js";

WScript.Quit(main());

function usage() {
  WScript.Echo("Retrieves a machine's Dell service tag and Express Service Code (ESC).\n"
    + "\n"
    + "Usage: " + SCRIPT_NAME + " <computername> | /tag:<servicetag>\n"
    + "\n"
    + "If you specify a computer name, the program will retrieve the computer's\n"
    + "service tag over the network. You can also specify an arbitrary service tag,\n"
    + "and the program will convert it to the equivalent Express Service Code value.");
  WScript.Quit(0);
}

function hex(n) {
  if (n < 0)
    return (n + 0x100000000).toString(0x10).toUpperCase();
  else
    return n.toString(0x10).toUpperCase();
}

function main() {
  var args, computer, servicetag, output, wmi, enclosures,
    expresscode, n;

  args = WScript.Arguments;

  // If an unnamed argument exists, use it as the computer name;
  // otherwise, parse the /tag parameter.
  if (args.Unnamed.length > 0)
    computer = args.Unnamed.Item(0);
  else {
    if (args.Named.Exists("tag")) {
      servicetag = args.Named.Item("tag");
      if ((servicetag == undefined) || servicetag == "")
        usage();
    }
  }

  // Display the usage statement if /? exists, or if neither a
  // computer name or service tag has been specified.
  if ((args.Named.Exists("?")) ||
    ((computer == undefined) && (servicetag == undefined)))
    usage();

  output = "";
// ******* BEGIN CALLOUT A *******
  // If a computer name has been specified, use WMI to connect
  // to the computer and retrieve the first instance of the computer's
  // Win32_SystemEnclosure object. This object's SerialNumber property
  // is the computer's service tag.
  if (computer != undefined) {
    try {
      wmi = GetObject("winmgmts:{impersonationlevel=impersonate}!"
        + "//" + computer + "/root/cimv2");
    }
    catch(err) {
      WScript.Echo("Error 0x" + hex(err.number) + " connecting to "
        + computer);
      return err.number;
    }
// ******* END CALLOUT A *******
    enclosures = new Enumerator(wmi.InstancesOf("Win32_SystemEnclosure"));
    servicetag = enclosures.item().SerialNumber;
    output += "Computer name: " + computer + "\n";
  }

// ******* BEGIN CALLOUT B *******
  // Create an array containing the digits in the service tag. Note
  // the argument to the parseInt function to specify base 36.
  expresscode = parseInt(servicetag, 36).toString().split("");
// ******* END CALLOUT B *******

// ******* BEGIN CALLOUT C *******
  // Insert a hyphen (-) after every third digit, starting at the fourth
  // position (index 3). We have to increment in "fours" to account
  // for the insertions.
  for (n = 3; n < expresscode.length; n += 4)
    expresscode.splice(n, 0, "-");

  output += "Service tag: " + servicetag + "\n"
    + "Express service code: " + expresscode.join("");
// ******* END CALLOUT C *******

  WScript.Echo(output);

  return 0;
}