--- title: "arch dsp (@archdsp) | Hashnode" description: "signal processing. Read the latest articles by arch dsp on Hashnode." url: "https://hashnode.com/@archdsp" --- @archdsp # arch dsp @archdsp · Joined January 2023 signal processing ### [Directory vs Folder](https://archdsp.hashnode.dev/directory-vs-folder?utm_source=hashnode&utm_medium=feed) Brief comparison table DirectoryFolder Need to map physical file system space occupiedNo need to be space not occupied container of files and folder, sub directorieslogical group of files 4KB size(inode)no specific size OS create, delet... 3 min read · [archdsp.hashnode.dev](https://archdsp.hashnode.dev/directory-vs-folder?utm_source=hashnode&utm_medium=feed) [Jul 26, 2023](https://hashnode.com/posts/directory-vs-folder/64c09e94878ca83436efdff6) ### [GPG My personal understand of gpg keygrip, fingerprint](https://archdsp.hashnode.dev/gpg-my-personal-understand-of-gpg-keygrip-fingerprint?utm_source=hashnode&utm_medium=feed) The picture above was made to understand the concept of gpg key structure, but it could be theoretically wrong because it was drawn with my personal interpretation. It seems that further updates are needed. A GPG key can also add a subkey and has th... 1 min read · [archdsp.hashnode.dev](https://archdsp.hashnode.dev/gpg-my-personal-understand-of-gpg-keygrip-fingerprint?utm_source=hashnode&utm_medium=feed) [Jun 21, 2023](https://hashnode.com/posts/gpg-my-personal-understand-of-gpg-keygrip-fingerprint/6492a17839cc1ef558c3486a) ### [2\. Basic Syntax](https://archdsp.hashnode.dev/2-basic-syntax?utm_source=hashnode&utm_medium=feed) import namespace Global import C# >=10 support global keyword. If import namespace with global keyword, that namespace can available over all .cs file. # GlobalUsings.cs global using System; It can be done by adding ImplicitUsings attribute on the .... 1 min read · [archdsp.hashnode.dev](https://archdsp.hashnode.dev/2-basic-syntax?utm_source=hashnode&utm_medium=feed) [May 18, 2023](https://hashnode.com/posts/2-basic-syntax/64658a5acd289512323d9dac) ### [1\. Start 'Hello world!'](https://archdsp.hashnode.dev/1-basic-syntax?utm_source=hashnode&utm_medium=feed) Set up the environment Download SDK Download dotnet SDK here. %\[https://dotnet.microsoft.com/\] You can check your SDK info on PowerShell by below command. dotnet --info Command output $ dotnet --info .NET SDK: Version: 7.0.300-preview.23122.5 Co... 3 min read · [archdsp.hashnode.dev](https://archdsp.hashnode.dev/1-basic-syntax?utm_source=hashnode&utm_medium=feed) [May 17, 2023](https://hashnode.com/posts/1-basic-syntax/64646b6a23f49fe329b18d25) ### [C# Preprocessor](https://archdsp.hashnode.dev/c-preprocessor?utm_source=hashnode&utm_medium=feed) Error and Warning #error: Invoke compiler error with message #warning: Invoke compiler warning with message #warning This is warning #error This is error Output Because of error directive, dotnet build Program.cs will print below output. $ dotne... 1 min read · [archdsp.hashnode.dev](https://archdsp.hashnode.dev/c-preprocessor?utm_source=hashnode&utm_medium=feed) [Jan 17, 2023](https://hashnode.com/posts/c-preprocessor/63c6eb6e22757e03ca8cce5a)