Resource management and error handling are critical in systems programming. RAII (Resource Acquisition Is Initialization) originated in C++ and ties resource lifecycles to object scope, with destructors automatically cleaning up resources. C lacks destructors and exceptions, but you can achieve similar semantics using established patterns that are battle-tested in production systems. The goto-based cleanup pattern…
Self-hosting a photo gallery gives you control over your content. If you want to skip database management entirely, a handful of PHP solutions still work—though most are unmaintained. This post covers what’s still functional, where the limits are, and when you should choose something else instead. Static File-Based Gallery Scripts Single File PHP Gallery Status:…
Vim’s default OCaml indentation is mediocre at best. The ocp-indent tool provides intelligent, syntax-aware indentation that respects OCaml conventions and integrates cleanly with Vim and Neovim. Installing ocp-indent Install via opam: opam install ocp-indent This installs the indentation engine and Vim plugin support. Verify the installation: which ocp-indent Configuring Vim Add this to your ~/.vimrc…
UDP (User Datagram Protocol) defined in RFC 768 provides a lightweight alternative to TCP. Unlike TCP’s stream-oriented approach, UDP delivers discrete packets — each recvfrom() or recvmsg() call returns one complete datagram. The tradeoff is real: you gain speed and lower overhead, but lose automatic reliability guarantees. Your application must handle packet loss, reordering, and…
Measuring time accurately matters for performance profiling, benchmarking, and latency-sensitive applications. Linux provides several APIs with different tradeoffs in resolution, overhead, and reliability. Understanding which to use prevents subtle bugs in production code. POSIX Time APIs: gettimeofday and clock_gettime gettimeofday() and clock_gettime() are the standard POSIX calls for reading system time. gettimeofday() returns seconds and…
John Ousterhout, a professor of computer science at Stanford, maintains a collection of “Favorite Sayings” grounded in decades of building real systems—RAMCloud, Tcl, and extensive work in distributed systems. These aren’t abstract principles. They’re lessons that apply directly to the work of building, debugging, and shipping software at scale. Optimize After Measurement, Not Before The…
The passwd command is designed for interactive use—it prompts for input rather than accepting passwords via stdin by default. When you need to set passwords programmatically (bulk user provisioning, CI/CD automation, remote administration), you need methods that bypass the interactive prompt. Using passwd with –stdin The –stdin flag tells passwd to read the new password…
WordPress spam attacks come in three distinct categories: comment spam, user registration abuse, and brute-force login attempts. A layered defense using complementary plugins and server-level hardening handles all three effectively. Comment Spam Protection Akismet remains the industry standard for comment filtering. It ships with WordPress by default and uses machine learning trained on millions of…
xclip is a utility that bridges the command line and X11 selections, letting you pipe command output directly to your clipboard. It’s indispensable for workflows where you’re generating content in the terminal and pasting it elsewhere—whether that’s a browser, text editor, or another application. Installation On Fedora/RHEL-based systems: sudo dnf install xclip On Debian/Ubuntu: sudo…
MediaWiki stores its main page configuration in the MediaWiki:Mainpage system message. By default, this points to “Main Page”, but you can change it to any title that suits your wiki’s purpose. This process involves updating the system message, creating your new homepage, and handling redirects properly to avoid breaking external links and SEO. Step 1:…
MediaWiki’s sidebar is managed through the MediaWiki:Sidebar special page, a simple text-based system that controls navigation for your entire wiki. Changes take effect immediately across all pages. Accessing the Sidebar Configuration Navigate to the sidebar editor using one of these methods: Direct URL (replace example.com with your domain): With pretty URLs: https://example.com/w/MediaWiki:Sidebar Without pretty URLs:…
SSH tunneling on Windows routes your traffic through a remote server over an encrypted connection, letting you bypass network restrictions and access resources as if you were on the remote network. The setup creates a SOCKS proxy that listens locally and forwards all traffic through the SSH tunnel. The traffic flow is straightforward: Your application…
Modern MediaWiki installations should prioritize responsive design, but you may still need explicit device-based skin switching for specific use cases. This guide covers both approaches and how to implement them correctly. Responsive Skins: The Recommended Approach The default solution is using a responsive skin that adapts automatically to screen size without separate configuration. Vector 2022…
MediaWiki’s default URL structure — www.example.com/w/index.php?title=TITLE — works functionally but creates poor SEO signals and awkward shareable links. Clean URLs like www.example.com/w/TITLE improve search visibility, readability, and user experience while making pages easier to reference. LocalSettings.php Configuration Open LocalSettings.php in your MediaWiki root directory and add these settings: $wgScript = “/w/index.php”; $wgArticlePath = “/w/$1”; The…
On most distributions: # Debian/Ubuntu sudo apt install xvkbd # Fedora/RHEL sudo dnf install xvkbd # Arch sudo pacman -S xvkbd xvkbd is an X11 tool for sending keyboard and mouse input to the focused window. It’s lightweight and useful for straightforward automation tasks, but has significant limitations that make it unsuitable for critical workflows….
The No-IP client automatically synchronizes your domain with your current public IP address. This is essential when hosting services on machines with DHCP-assigned IPs or when you need reliable DNS without paying for static IP assignments. Installation From Package Repositories Most distributions package noip2 in their standard repos: Debian/Ubuntu: sudo apt install noip2 Fedora/RHEL/CentOS: sudo…
ASCII stands for American Standard Code for Information Interchange. It’s a 7-bit character encoding standard mapping numeric values (0-127) to printable characters and control codes. Since computers work with numbers at the lowest level, ASCII provides a universal way to represent text—each character has a unique numeric value. Standardized in 1963, ASCII remains foundational to…
cppreference.com is the authoritative resource for C++ language and standard library documentation. It covers all C++ standards from C++98 through C++26 with clear examples and cross-references. Bookmark it as your primary reference. The official C++ standard drafts are available through the C++ standards committee. While final standards require purchase, draft versions and proposals are freely…
Windows 7 reached end of support in January 2020. If you’re maintaining legacy Windows 7 Enterprise systems with Multiple Activation Keys (MAK), here’s how to handle activation for those remaining machines. MAK activation applies to Windows 7 Enterprise editions obtained through Microsoft Volume Licensing agreements. Each MAK has a limited number of allowed activations, so…
Printing PDF annotations with fidelity across different readers requires understanding each tool’s specific workflow. The fundamentals haven’t changed much, but modern versions offer more reliable options than they did years ago. Adobe Acrobat (Full Version) Acrobat provides the most control over annotation printing, but requires explicit configuration before print. Enable annotation printing in preferences: Open…