Reading

Batch Script Arguments

Learn how Windows Batch scripts read command-line arguments using positional parameters, SHIFT, and path modifiers like %~dp0.

Environment Variables in Batch

Understand how Windows Batch scripts create, read, scope, and persist environment variables, including the tricky topic of delayed expansion.

Reading and Writing Text Files

Learn how Batch scripts write to files with redirection and read them back using FOR /F, SET /P, and FINDSTR.

Variables in Batch Scripts

Learn how Windows batch scripts store, read, and manipulate values using the set command, environment variables, delayed expansion, and substring syntax.

Silverlight Debugging

Practical techniques for diagnosing binding failures, cross-thread exceptions, and network issues in Silverlight applications using Visual Studio and browser t…

Reading and Writing Data Sources

Learn how Spark's DataFrameReader and DataFrameWriter APIs handle formats like Parquet, CSV, and JDBC, plus schema handling and partitioned writes.

Registry and Environment

Learn how PowerShell exposes the Windows Registry and environment variables as navigable drives, and how to safely read and modify both.

Approvals

Build sequential and parallel approval processes in Power Automate using the dedicated Approvals connector and custom responses.

Execution Plans and Tuning

How to read SQL Server execution plans, identify costly operators, and apply indexing and query rewrites to improve performance.

Reading and Writing Files

The r, R, w, and W commands let sed pull the contents of external files into the output stream and write matched lines out to separate files during a single pa…

The n and N Commands

Understand how sed's lowercase n and uppercase N commands pull additional input lines into processing, and how they differ in what they do to the pattern space.

Reading Common Sensors

Learn how to interface Arduino with common sensors — potentiometers, light-dependent resistors, temperature sensors, PIR motion detectors, and ultrasonic range…

Reading and Writing Cell Data

How to read from and write to worksheet cells in VBA using the Range and Cells objects, and how to move data efficiently between the sheet and VBA arrays.

File I/O in Tcl

Reading, writing, and managing files and channels in Tcl using open, read, gets, puts, and the channel configuration commands.

Reading and Writing Data Files

Learn MATLAB's core file I/O functions for reading and writing text, CSV, and binary data, including readmatrix, writematrix, and low-level fopen/fprintf.

Data Import and Export in R

Master reading and writing common file formats in R — CSV, Excel, and RDS — and know which function fits which situation.

Your First Perl Script

A hands-on walkthrough of structuring, running, and debugging a complete beginner Perl script that reads, processes, and prints data.

Debugging WebSocket Connections

Practical techniques for diagnosing failed handshakes, dropped connections, and mysterious silent disconnects in WebSocket-based applications.

Reading EXPLAIN ANALYZE

Learn to interpret PostgreSQL's EXPLAIN ANALYZE output so you can tell what a query planned versus what it actually did, and use that gap to fix slow queries.

Request and Response Bodies

Learn how Spring Boot serializes and deserializes JSON request and response bodies using @RequestBody, @ResponseBody, and Jackson.

Hashes in Redis

Learn how Redis Hashes model field-value objects efficiently, covering HSET/HGET, partial updates, memory-efficient small-hash encoding, and common object-mode…

Redis Streams

How Redis Streams model an append-only log, and how XADD, consumer groups, and trimming work together for durable event processing.

Reading and Writing Files in Python

Explore the different methods for reading and writing file content, including read(), readline(), readlines(), write(), and writelines().

ROC Curves and AUC

A visual and numeric tool for evaluating a binary classifier's ability to distinguish classes across all possible decision thresholds, independent of any singl…

C File I/O Cheat Sheet

Covers reading and writing text and binary files in C using fopen, fread and fwrite, formatted I/O, and file positioning functions.