This guide walks through practical Python web‑scraping techniques using urllib2, covering basic page fetching, proxy usage, cookie handling for logins, form submission, header spoofing, anti‑hotlink tricks, multithreaded crawling, and strategies for bypassing simple captchas, all illustrated with code snippets.
This guide explains how to use lsof and the /proc filesystem to locate open file descriptors of deleted logs or database files and restore their contents while the owning process remains active.
This article clarifies Unix I/O models by distinguishing synchronous and asynchronous operations, explaining blocking versus non‑blocking behavior, and summarizing the five classic I/O models with practical insights drawn from Richard Stevens' authoritative definitions.
Google announced at I/O that its Dart language will soon run on App Engine via managed VMs and custom runtimes, while also supporting Docker deployment, async/await features, and broader Chrome integration, aiming to make Dart a general‑purpose, front‑end and back‑end language with strong tooling and industry adoption.
This guide walks through typical Nginx problems—from socket permission errors and load‑balancing weight settings to cache‑control headers, gzip configuration, high‑concurrency tuning, and debugging directives—offering step‑by‑step fixes and configuration examples for Linux environments.
Learn how to install Celery, configure it with Redis as a broker, write a simple task to send emails asynchronously, and run workers, all demonstrated with clear code snippets and step‑by‑step instructions for Python developers.
This article explains Facebook's Hiphop tool, its evolution from static PHP-to-C++ compilation to HHVM with JIT, and provides a detailed walkthrough of compiler fundamentals including lexical, syntax, and semantic analysis, intermediate code generation, optimization, and code generation.
This comprehensive guide offers a step‑by‑step learning roadmap for new programmers, covering essential scripting languages, Unix/Linux tools, web fundamentals, advanced C/Java topics, databases, system programming, and practical projects to build solid technical foundations.
Discover practical GitHub shortcuts—including diff whitespace ignoring, author commit filtering, branch comparison URLs, Gist embedding, short URL creation, line highlighting, quick quoting, task lists, and diff/patch retrieval—to streamline your development workflow and save time.
This article examines common website architecture layers, compares hardware (F5) and software (LVS, Nginx) load‑balancing solutions, discusses high‑availability setups with Keepalived/Heartbeat, evaluates their network dependencies, and offers practical recommendations for choosing and monitoring load‑balancers, file servers, and databases in high‑traffic environments.
This article explains the definitions of Time on Site (Ts) and Time on Page (Tp), demonstrates how to calculate them with detailed examples—including multi‑tab browsing—and presents a solution for capturing accurate page‑close timestamps to improve session‑time measurement.
Linux provides only a kernel that must be combined with a myriad of distributions, uses the GPL, and offers broader hardware support for desktops, while BSD delivers a complete, single‑project operating system under a permissive BSD license, emphasizing stability, security, and vendor freedom, especially for servers.
The article examines Google’s upcoming Quantum Paper design framework, its relationship to Polymer, leaked UI screenshots, and how the unified approach could reshape user experiences across Android, iOS, and web platforms while offering developers a single component library.
When a compute node in an OpenStack‑KVM private cloud crashes and its Linux virtual machines become read‑only, this guide explains why the filesystem turns read‑only and provides step‑by‑step instructions to repair it using fsck.
This guide introduces Linux Logical Volume Manager (LVM), explains its core concepts such as physical volumes, volume groups, and logical volumes, and provides step‑by‑step procedures for checking versions, handling common failures, and performing disaster‑recovery operations on both server and desktop systems.
An in‑depth overview of VMware’s extensive product lineup—including data‑center and cloud infrastructure tools, management suites, desktop virtualization, and free utilities—explains each solution’s purpose, key features, and typical use cases for enterprises and individual users alike.
This guide walks through locating MySQL's configuration file on Linux, copying a sample cnf, editing it to set default-character-set=utf8 for client and server, restarting MySQL, and verifying the change with SHOW VARIABLES, plus alternative methods via SQL commands and database options.
This article explains the differences between parallel and serial hard‑disk interfaces, details ATA and SCSI protocols, and compares three major storage architectures—Direct‑Attached Storage (DAS), Network‑Attached Storage (NAS), and Storage Area Networks (SAN)—including their use cases, performance, and cost considerations.
Software bugs are often whimsically named after famous scientists, with Bohrbug representing reproducible errors, Heisenbug describing elusive issues that disappear under observation, Mandelbug denoting complex, chaotic faults, and Schroedinbug reflecting paradoxical bugs that seem both present and absent, each illustrating distinct debugging challenges.
This article explains how the image‑to‑text ratio, or visual proportion of graphics on a page, influences readability and overall feel, and offers practical frontend design techniques—such as background color tweaks, color blocks, repeated imagery, rhythmic layouts, and graphic elements—to optimize that ratio for a more engaging user experience.
