peteraritchie

The structure of IPv4 addresses lies at the core of the internet's architecture

• does calling out IPv4 mean many of the details in this chapter apply to IPv6?

The very structure of IPv4 addresses presents an interesting duality: they serve as both identifiers and locators.

• "Locator" in what sense?

[Just as a street address indicates a specific location, an IP address designates a particular device on a network. The subnet mask, analogous to the zip code, guides data packets to their intended destination.](https://cwoodruff.github.io/book-network-programming-csharp/chapter02/#:~:text=just%20as%20

peteraritchie

HTML Entities

general

HTML		Description	HTML		Description	HTML		Description
℅	℅	care of	℞	℞	prescription	⌖	⌖	target
⁃	⁃	hypen bullet	⦾	⦾	circled white bullet	⦿	⦿	circled bullet
 		very thin space	​	​	zero-width space

Arrows

peteraritchie

<Project>
  <!-- See https://aka.ms/dotnet/msbuild/customize for more details on customizing your build -->
  <PropertyGroup>
  </PropertyGroup>
  <Target Name="PostClean" AfterTargets="Clean">
    <RemoveDir Directories="$(BaseIntermediateOutputPath)" />
    <RemoveDir Directories="$(BaseOutputPath)" />
  </Target>
</Project>

peteraritchie

<# e.g.:
. .\visual-studio-classes.ps1

$csproj = [Project]::CreateClassLib(".\Solution\ClassLib\ClassLib.csproj");
$csproj.AddClass('MyClass');
#>
class Project {
	[string]$Folder;

    Project() {

peteraritchie

CREATE

Clone an existing repository

$ git clone ssh://user@domain.com/repo.git

Create a new local repository

$ git init

LOCAL CHANGES

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Visual Studio HTTP Files

env

{
  "dev": {
    "ClientSecret": {
      "provider": "AzureKeyVault",
      "secretName": "clientSecret",

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Search for

^(?'tab'\s*)try\s*\r?\n+\k<tab>\{\r?\n(?'tried'(.*\r?\n)+)\k<tab>\}\r?\n\k<tab>catch\s+.*\r?\n\k<tab>\{\s*\r?\n(?'caught'(.*\r?\n)+)\k<tab>\}(\r?\n)+

Replace with:

${tried}

---

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Install a single PowerShell module file (psm1)

$AllUsersModules=($Env:PSModulePath -split ';')[1]
$moduleName="Do-TheThing"
md ($AllUsersModules+"\"+$modeuleName)
copy $modeuleName.psm1 ($AllUsersModules+"\$modeuleName"
dir ($AllUsersModules+"\send-settingchange")
get-module -ListAvailable

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  	public async Task Start()
		{
			Console.WriteLine(Environment.CurrentManagedThreadId);
			try
			{
				await DoSomething2(null);
			}
			catch (Exception ex)
			{
				Console.WriteLine("{0}: {1}", ex.Message, Environment.CurrentManagedThreadId);

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public static IEnumerable<char> GetKeys()
{
	while (true)
	{
		yield return Console.ReadKey().KeyChar;
	}
}