Publishing a package to the npm registry involves a decision that is easy to get wrong: which files from the project directory end up in the published tarball. Three mechanisms compete for this decision—.gitignore, .npmignore, and the files field in package.json—and their precedence rules are not intuitive. A .gitignore entry that excludes a secrets file…
gdisk is the GPT-aware counterpart to fdisk. It shares the same interactive, menu-driven interface—the same letters for new, delete, type, print, write, and quit—but it operates on GUID Partition Table disks exclusively. Where fdisk asks whether a partition is primary or extended, gdisk does not, because GPT has no such distinction. Every GPT partition is…
fdisk is the traditional interactive partition editor for Linux, and it remains the tool the LFCS exam expects you to know for MBR disks. Modern versions of fdisk from util-linux also handle GPT, which means a single tool can inspect and modify both table types, but the menu flow and the partition-numbering rules differ between…
Partitioning is the act of dividing a physical disk into logical regions that the operating system treats as separate block devices. Every filesystem, swap area, and LVM physical volume begins as a partition or a whole disk. The LFCS objective is not about memorizing the fdisk menu; it is about understanding the two partition table…
The root password reset is the most common boot recovery procedure and the one most likely to appear on the LFCS exam as a practical task. The procedure has three stages: interrupt the boot to reach a shell that runs before authentication, remount the filesystem so it can be written, and change the password. The…
Single-user mode is the boot state in which the system starts with minimal services and presents a root shell without requiring the normal multi-user login sequence. On systemd systems, the equivalent states are rescue.target (single-user mode, local filesystems mounted, networking stopped) and emergency.target (root mounted read-only, almost nothing else). The distinction matters for recovery: rescue.target…
Vue’s reactivity system is often described as “magic,” but the mechanism is a small set of cooperating functions. A Proxy intercepts property access and calls track to record who is reading. The same Proxy intercepts property writes and calls trigger to notify everyone who was recorded. The EffectScope wraps this machinery in a lifecycle boundary,…
Vue’s reactivity system is undergoing its most significant architectural change since Vue 3.0. In Vue 3.6, the core dependency-tracking algorithm is being replaced with Alien Signals, a standalone signal library developed by Vue core contributor Johnson Chu . The change is not a surface-level optimization; it is a rewrite of the mechanism that answers the…
Vue 3’s performance advantage over Vue 2 comes primarily from the compiler, not from a faster runtime diff algorithm. The compiler analyzes the template at build time and emits metadata that tells the renderer exactly which parts of the tree can change and which cannot. Static Hoisting removes immutable nodes from the render function entirely,…
Vue’s virtual DOM is not a pure runtime diffing engine. It is a hybrid system in which the template compiler and the runtime renderer cooperate. The compiler analyzes the template, identifies which parts are static and which are dynamic, and emits optimization hints that the renderer uses to skip unnecessary work . The VNode—a plain…