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Console Apps in .NET

Learn how .NET console applications are structured, how they read input and produce output, and how they're built and published as standalone command-line tool…

Addresses and Line Selection

How to target specific lines in sed using line numbers, regex patterns, ranges, and the negation operator so commands run only where you want.

Line Ranges and Steps

Selecting spans of lines in sed using numeric ranges, the $ last-line symbol, regex-bounded ranges, and GNU's first~step notation for periodic selection.

What Is sed?

An introduction to sed, the non-interactive stream editor that transforms text line by line as it flows through a pipeline.

Command Line Arguments in C

Learn how argc and argv let C programs read command-line input, with parsing and string-to-number conversion examples.

MVVM in SwiftUI

Understand how the Model-View-ViewModel pattern maps onto SwiftUI's declarative views, when it earns its complexity, and how it differs from plain @State-drive…

Ruby Comments and Documentation

How to write single-line and multi-line comments in Ruby, and how to document code using RDoc/YARD conventions for generated API docs.

Command-Line Arguments and getopts

Learn how Bash scripts receive positional parameters, how to shift and iterate over them, and how to build proper option parsing with getopts.