When you install Fedora (or other Linux distributions) alongside Windows on a UEFI system, GRUB sometimes fails to generate a functional boot entry for Windows. The symptom is a missing or non-working “Windows Boot Manager” entry in the GRUB menu, or GRUB drops you to a shell prompt when you select it. Why This Happens…
When managing LVM storage, you need to know which physical disks support each logical volume — especially for risk assessment when hardware fails. This guide shows you how to trace those relationships. Using lvdisplay to map extents The lvdisplay command with the –maps flag shows how logical extents map to physical volumes: lvdisplay –maps This…
The most reliable way to download YouTube videos is yt-dlp, a maintained fork of youtube-dl that handles modern YouTube changes and DRM protections. It works on Linux, macOS, and Windows. Installation Linux (Debian/Ubuntu): sudo apt install yt-dlp Linux (Fedora/RHEL): sudo dnf install yt-dlp macOS: brew install yt-dlp Windows or any system with Python 3.8+: pip…
Getting video files from your Linux machine to an iPhone for offline viewing doesn’t require iTunes or complex workarounds. Here are the practical methods that actually work in 2026. Quick Upload via VLC’s WiFi Interface VLC for iOS remains the most straightforward approach for occasional transfers. It’s free, open-source, and handles virtually any codec you…
Emacs doesn’t restore your cursor to the last editing position by default—Vim does this out of the box. Fortunately, save-place-mode is built into Emacs and requires minimal configuration to enable this behavior. Basic Setup Add this to your ~/.emacs.d/init.el: (save-place-mode 1) That’s all you need. The mode automatically saves your cursor position when you close…
SSH tunneling and port forwarding work well for specific traffic, but they don’t give you a full VPN-like experience where all system traffic routes through the remote server. If you need transparent, system-wide traffic redirection over SSH, you have several solid options depending on your platform. sshuttle on Linux and macOS sshuttle is the standard…
UDP packet loss on Linux commonly stems from undersized kernel buffers. When packets arrive faster than the application can process them, the kernel drops excess datagrams silently. Unlike TCP, UDP offers no retransmission, so these losses are permanent. Proper buffer tuning is essential for DNS servers, NTP, monitoring systems, video streaming, and any high-throughput UDP…
The HTML5 <video> element is the standard for embedding video content without plugins. It’s supported across all modern browsers and provides native playback controls, accessibility features, and performance benefits. Basic Video Embedding The simplest approach uses the <video> element with a <source> tag: <video controls> <source src=”path/to/file.mp4″ type=”video/mp4″> Your browser does not support the video…
The fclose theme is a lightweight Question2Answer theme distributed as a set of PHP and CSS files. It provides a clean base layout that you can extend with custom styling and icon sets. Getting the Theme Files You need two core files to run fclose: qa-theme.php — The theme class that extends qa_html_theme_base and controls…
When processing text files or command output, non-printable ASCII characters corrupt formatting, break parsing, or create unexpected behavior. You need the right tool for your specific case — whether you’re stripping control characters, handling UTF-8, or cleaning up embedded escape sequences. Understanding Printable ASCII The standard printable ASCII range includes: Tab (hex 09) Line Feed…
awk is the most efficient approach for this task. It processes the file in a single pass and doesn’t load data into memory: awk ‘{ total += $5; count++ } END { print total/count }’ file.txt This assumes your numeric value is the 5th whitespace-delimited field. For a file like: Run 0: Time used: 22.235331711…
The simplest approach is passing log level flags directly to sbt: sbt –error “compile” sbt –warn “clean compile” sbt –info “test” sbt –debug “publishLocal” Common log level flags: –error — errors only –warn — warnings and errors (default) –info — info, warnings, and errors –debug — verbose debugging output –trace — most verbose, rarely needed…
The standard way to generate patches from git commits is git format-patch. This creates email-ready patch files that include commit messages, author information, and metadata. # Create a patch from the last commit git format-patch -1 # Create patches for the last N commits git format-patch -3 # Create patches from a specific commit onwards…
When working with multiple Scala projects, you’ll often need different sbt versions. A project using sbt 1.9.x may not be compatible with sbt 0.13.x, and manually switching between system-wide installations becomes tedious and error-prone. Using sbt-extras for automatic version detection The most reliable approach is sbt-extras, a wrapper script that automatically detects and uses the…
The simplest approach creates a JAR with just your project’s compiled classes: sbt package This outputs to target/scala-2.x.y/projectname_2.x.y-zz.jar. The naming convention includes the Scala version to prevent classpath conflicts when multiple Scala versions coexist. For iterative development, use watch mode: sbt ~package This rebuilds the JAR after every source change. However, this JAR only contains…
If you need millisecond precision timestamps from the command line, there are several approaches depending on your use case and system requirements. Using date with %3N The simplest and most reliable method on modern GNU coreutils (8.32+) is: date +%s%3N This outputs seconds since epoch followed by exactly three digits of nanosecond precision (milliseconds). Example…
To determine file size in C, use stat() to populate a struct stat and read the st_size field. Here’s the correct approach: #include <sys/stat.h> #include <stdio.h> off_t file_length(const char *path) { struct stat st; if (stat(path, &st) == -1) { perror(“stat”); return -1; } return st.st_size; } Why off_t and not long Using off_t as…
Eclipse CDT has evolved to handle CMake projects effectively. The key is understanding which approach fits your workflow — native CMake integration (recommended for 2023+ versions) or generating build files. Native CMake Integration (Recommended) Eclipse CDT 2023 and later include robust native CMake support. This is the simplest approach for new projects or when you…
When a process receives a signal from kill or pkill, it needs a signal handler to intercept and respond to it. Without one, most signals terminate the process immediately. This guide covers setting up robust signal handlers for production daemons. Understanding Signals The kill command sends signals to processes. By default, it sends SIGTERM (signal…
If you’ve compiled a kernel module for a specific kernel version or need to pin a package to prevent automatic updates, you’ll want to exclude it from yum or dnf. There are several approaches depending on whether you need a permanent exclusion, per-repository exclusion, or temporary lockdown. Global Exclusions in Configuration The simplest approach is…