Practical notes for developers and system engineers
Read a JSON file with PowerShell ConvertFrom-Json, retrieve properties and array items, and handle parsing errors. Includes Windows PowerShell 5.1 and PowerShell 7 differences.
Export a WSL distribution to tar, restore it under a different name, and check its files and Linux user while keeping the original Ubuntu environment.
Find matching log lines and line numbers with Select-String. Use literal text, regular expressions, case sensitivity, Quiet and AllMatches.
Combine folder and file names with Join-Path. Handle separators and nested paths, and understand Test-Path, Resolve and version differences.
List files by extension, include subfolders or hidden files, and choose file objects or relative names with Get-ChildItem.
Check a WSL web app from Linux through TCP and HTTP on Windows, using a loopback-only test server to narrow down localhost connection failures.
Find the SSH executable and client config file, inspect Host matches, and diagnose setting order and command-line overrides with ssh -G.
Check SSH or HTTPS TCP connectivity on Windows and distinguish network reachability from DNS, authentication and certificate failures.
Query A and AAAA records, inspect configured DNS servers, and compare a specific resolver without changing Windows DNS settings.