Code quality, clean code, refactoring, maintainability, and software engineering best practices.
MPlayer reached end-of-life in 2010 and hasn’t received updates since. If you’re still using it, you’re missing years of improvements in video decoding, filtering, and performance. For new projects, use mpv instead—it’s the maintained fork that incorporates MPlayer’s codebase with significant enhancements. That said, if you’re stuck maintaining legacy MPlayer setups, here’s how to optimize…
Double-blind peer review is a standard evaluation process used by many academic conferences and journals, particularly in computer science. Understanding how it works is essential before submitting your paper. What is Double-Blind Review? Double-blind review means that reviewers and authors remain anonymous to each other throughout the evaluation process. Neither party knows the identity of…
Spark SQL doesn’t have a separate DDL/DML specification distinct from Hive QL — it inherits its SQL dialect directly from Hive. If you’re designing a SQL engine or looking to understand Spark SQL’s data definition and manipulation capabilities, you need to reference Hive’s DDL and DML documentation. Why Spark SQL Uses Hive QL Spark SQL…
A sequence point is a point in execution where all side effects from previous evaluations are guaranteed to be complete and visible. Understanding sequence points is critical for writing correct C code, especially when dealing with expressions that modify variables. The C standard defines side effects as changes to the state of the execution environment…
Attaching storage to a running Xen DomU without rebooting is straightforward using the xl toolstack. This is useful when you need to add capacity, attach backup storage, or provision new volumes without downtime. Basic Disk Attachment To attach a logical volume or physical disk to a running DomU, use xl block-attach on Dom0: xl block-attach…
GDM (GNOME Display Manager) lets you control which users appear on the login screen. You have two main options: hide the entire user list or exclude specific users while keeping the list visible for others. Disable the user list entirely The most straightforward approach is to disable user listing completely. This forces everyone to type…
By default, crond sends email notifications whenever a cron job produces output or encounters an error. For high-volume cron jobs or systems without a mail server, you’ll want to disable these notifications. Redirect output to /dev/null The simplest approach is to discard all output from your job: 0 2 * * * /usr/local/bin/backup.sh > /dev/null…
WordPress sanitizes HTML in comments by default for security. The <pre> tag is stripped unless you explicitly whitelist it. Here’s how to enable it without compromising security. Using wp_allowed_post_html Filter The proper approach is to whitelist <pre> and related tags via the wp_allowed_post_html filter: function allow_pre_in_comments( $allowed ) { $allowed[‘pre’] = array(); $allowed[‘code’] = array(…
MPlayer is effectively unmaintained. If you’re starting fresh, use mpv — the actively maintained fork with better codec support, hardware acceleration, and improved filter performance. That said, if you’re working with existing MPlayer setups, you can still improve playback quality through filters. When to Use Filters vs. When to Switch Before spending time tuning MPlayer,…
To toggle between Simplified Chinese and Traditional Chinese input modes in ibus-libpinyin, press Ctrl+Shift+F. This shortcut has been the standard method since ibus-pinyin 1.3.7 and works across modern versions. Common ibus-libpinyin Shortcuts Beyond script conversion, these shortcuts handle daily input tasks: Shortcut Function Ctrl+Shift+F Toggle Simplified/Traditional Chinese Ctrl+. Toggle full-width/half-width punctuation Ctrl+, Toggle English/Chinese punctuation…
YARN (Yet Another Resource Negotiator) fundamentally restructured Hadoop 2.0 by decoupling resource management from application logic. If you’re transitioning from Hadoop 1.x or building systems on top of YARN, understanding its architecture is essential for effective cluster administration and application development. Essential Reading The foundational paper Start with “Apache Hadoop YARN: Yet Another Resource Negotiator”…
dd is a powerful utility for reading and writing raw data to block devices. While it’s a Linux standard, you have several options for using it on Windows systems. WSL2: The Modern Approach For Windows 10 (21H2+) and Windows 11, Windows Subsystem for Linux 2 (WSL2) is the best choice. It provides a full Linux…
If you want Emacs to run in the terminal without opening an X window, you have several practical options depending on your setup and workflow. Option 1: Install emacs-nox (Recommended for servers) The cleanest approach is installing the no-X variant of Emacs, which is built without X11 support. This reduces memory overhead and startup time…
If you’re working with legacy BIOS systems and MBR partition tables, Fedora’s installer can sometimes misdetect your firmware mode and attempt UEFI/GPT setup on hardware that only supports legacy BIOS. This guide covers the proper approach for Fedora 39+ on MBR systems. Prerequisites Before starting, verify your system configuration: Boot the installer in legacy BIOS…
Fedora upgrades are straightforward with dnf system-upgrade, the standard tool for network-based distribution upgrades. This replaces the older fedup tool and handles everything from downloading packages to managing the upgrade environment. Pre-Upgrade Checklist Before starting any upgrade: Update your current system: sudo dnf upgrade Back up critical data — especially /etc, home directories, and application…
Fedora uses FirewallD as its default firewall management service. If you’re running servers in a trusted internal cluster or isolated environment where network-level filtering isn’t needed, you can disable it entirely. Stop and Disable FirewallD To completely disable the firewall: sudo systemctl stop firewalld sudo systemctl disable firewalld The stop command halts the service immediately….
Line number displays in Emacs can feel cramped without proper spacing. Modern Emacs provides built-in control over line number formatting and width—no external packages needed. Using display-line-numbers-mode display-line-numbers-mode is the standard in Emacs 25+ and should be your default choice. It’s faster and more maintainable than the older linum-mode. Enable it globally: (global-display-line-numbers-mode t) To…
Thunderbird stores message filters in per-account configuration files, making it inconvenient to replicate filters across multiple accounts or installations. Rather than recreating filters manually, you can copy filter files directly or use symbolic links to keep filters synchronized. Where Thunderbird Stores Filters Thunderbird saves filter rules in msgFilterRules.dat, a plain text configuration file. Each account…
If xterm displays Chinese, Japanese, or Korean characters as empty boxes or rectangles, the problem is almost always a missing or improperly configured font with CJK glyphs. Configure fonts in ~/.Xresources xterm reads font configuration from ~/.Xresources. Add these lines: XTerm*utf8: 1 XTerm*locale: true XTerm*faceName: Noto Mono XTerm*faceSize: 11 XTerm*faceNameDoublesize: Noto Mono XTerm*dynamicColors: true The…
The built-in Print Screen workflow is cumbersome — capture, open Paint, paste, crop, save. There are better approaches depending on your needs. Snipping Tool and Snip & Sketch On Windows 7, the Snipping Tool is available through the Start menu. Press the Windows key, type “snipping tool”, and launch it. You get basic capture modes:…