This article explains the simple arithmetic principle behind a New Year magic trick and provides a complete Go program that calculates the hidden number, interacts with the user, and demonstrates the trick with sample input and output.
This guide introduces websocat, a Rust‑based command‑line utility for WebSocket, covering installation via package managers or source, basic echo testing, setting up local servers, bidirectional TCP‑WebSocket proxying, secure connections, performance tuning, and integration with systemd and Nginx.
This article explains the fundamentals of SSL/TLS, why transport‑layer encryption is essential, and provides a hands‑on guide to using OpenSSL on Linux for symmetric and asymmetric encryption, hashing, password generation, random number creation, and base64 encoding with clear command‑line examples.
This article introduces Ubuntu’s Uncomplicated Firewall (UFW), explaining how to enable, disable, reset, set default policies, and create, modify, or delete specific IP, port, and protocol rules using concise command-line examples, helping users quickly secure client machines with practical firewall configurations.
This comprehensive Go tutorial walks you through installing Cobra, initializing a project, creating basic and advanced commands with flags, subcommands, configuration, colored and table output, building a Todo CLI with persistence, and cross‑platform compilation and automated release, empowering you to craft professional command‑line tools.
This guide walks you through a rapid 60‑second Linux performance analysis, detailing key commands like uptime, dmesg, vmstat, mpstat, pidstat, iostat, free, sar and top, and explains how to interpret their most important metrics for troubleshooting system issues.
This article shows how Netflix's performance engineering team uses ten essential Linux commands—such as uptime, vmstat, mpstat, iostat, and top—to quickly assess system load, resource saturation, and errors within the first minute of investigation, following the USE method.
This guide introduces a collection of entertaining Linux command-line utilities—including figlet for ASCII art text, aafire for flame effects, fortune for random quotes, yes for repeated output, sl for a steam locomotive, cowsay for talking cows, cmatrix, asciiquarium, asciiview, hollywood, ninvaders, and bastet—detailing their installation via yum or apt and example usage commands.
This guide shows how to install Multipass on Windows, Linux, or macOS, use its commands to list, launch, inspect, and manage Ubuntu virtual machines, and automate setup with cloud‑init, offering a free, lightweight alternative to paid VM solutions.
This tutorial walks you through installing Zsh on Ubuntu 20.04, setting it as the default shell, configuring its initial options, using a quick .zshrc setup, and reverting back to Bash if needed, with all commands and screenshots included.
This article introduces essential JDK command‑line tools such as jps, jinfo, jstat, jmap, jhat and jstack, explaining their options, usage examples, and how they help developers monitor, diagnose and troubleshoot Java applications in production environments.
This article introduces the open‑source SQL optimization tool Soar, explains its core features, configuration methods, heuristic rules, multiple report formats, syntax checking, SQL rewrite capabilities, EXPLAIN analysis, markdown‑to‑HTML conversion, and how to clean up test artifacts, providing concrete command‑line examples throughout.
This article guides JavaScript developers through creating a simple Node.js command-line interface (CLI) tool from scratch, covering setup, scripting, permission handling, environment variables, npm packaging, publishing, and best practices, enabling efficient custom command creation.
This guide introduces a collection of entertaining Linux terminal commands—including sl, fortune, cowsay, cmatrix, figlet, toilet, oneko, xeyes, yes, cal, shred, factor, and more—explains how to install each with apt‑get, shows typical usage examples, and warns about dangerous commands like sudo rm -rf /*.
This article provides a detailed reference of the official Geth client’s command‑line flags, covering general commands, Ethereum‑specific options, developer mode, API and console settings, mining parameters, gas‑price controls, logging/debug features, deprecated flags, and a link to the official documentation.
This guide explains how to link the Ethereum Wallet client with a local Geth node on both Windows and macOS, covering process inspection, IPC sharing, the attach command, and alternative launch options to avoid duplicate nodes and port conflicts.
Learn the essential Linux command-line tools and step-by-step commands you need to run within the first minute of logging into a server to quickly assess process activity, resource usage, and potential bottlenecks, enabling effective performance troubleshooting in production environments.
When a Linux server suddenly spikes in load, this guide shows how to pinpoint the root cause within a minute by running ten key commands that reveal CPU, memory, disk I/O, and network metrics.
