Programming languages and software development
MKV (Matroska) containers frequently contain multiple audio tracks. You can cycle through them during playback using keyboard shortcuts. Using mplayer Press # to cycle through available audio tracks while the video is playing. This works for MKV, AVI, MPEG, and other container formats that mplayer supports. mplayer video.mkv # Then press # during playback to…
If you’re still seeing Chrome warnings about Flash Player being out of date on Linux, understand that Adobe discontinued Flash Player entirely in December 2020. Chrome removed all Flash support in version 88 (early 2021) and has no mechanism to run Flash content anymore. If you’re encountering this message in 2026, you’re likely: Using an…
You have two branches with diverging histories and need to apply only certain commits from one branch to another. Git’s cherry-pick command lets you do exactly that. The scenario Say you have: dev branch: c0 → c1 → c2 → c3 → c4 master branch: c0 → c5 → c6 Commits c2 and c3 fix…
SSH tunneling is one of the most reliable ways to create a secure proxy on Windows. You can route traffic through a remote SSH server, encrypting your connection and bypassing local network restrictions. Prerequisites You’ll need: An SSH server with valid credentials An SSH client (Windows 10/11 includes OpenSSH, or use PuTTY, Git Bash, or…
If you follow accounts but they don’t follow you back, you’ll want a reliable way to identify those one-sided relationships. Here’s how to approach it in 2026. Native X/Twitter Tools X’s official analytics and settings have evolved. While the platform doesn’t provide a built-in “find non-followers” feature in the main UI, you can use: Through…
Vim ships with built-in completion that many people don’t fully leverage. Before reaching for plugins, understand what’s already available: Ctrl+N / Ctrl+P: Basic keyword completion from open buffers and loaded files Ctrl+X Ctrl+F: Filename completion Ctrl+X Ctrl+]: Tag completion (requires ctags) Ctrl+X Ctrl+O: Omnicompletion (language-aware, when available) The omnicompletion (Ctrl+X Ctrl+O) is what resembles IDE…
The default Vim plugin directory structure under ~/.vim is inherently messy. Without a plugin manager, files from different plugins scatter across autoload/, plugin/, ftplugin/, colors/, and other directories, making it difficult to track which files belong to which plugin. Removing a plugin requires manually hunting down and deleting its files across multiple locations. Several plugin…
If you’ve merged a branch and want to undo it, Git provides several approaches depending on your situation. The key difference is whether you have uncommitted local changes and whether the merge has already been pushed. Using git reset for unpushed merges If the merge is only in your local repository and hasn’t been pushed,…
This guide covers setting up PHP with Apache’s httpd on Fedora systems. The setup provides standard PHP support suitable for most development and production environments. Install Apache httpd Start by installing the Apache web server package: sudo dnf install httpd On Fedora 22 and later, dnf is the default package manager (replacing yum). If you’re…
By default, Vim searches case sensitively. You can match dog, Dog, DOG, and other case variations using one of three approaches. Using the ignorecase Option The simplest method is to enable the ignorecase setting: :set ignorecase Now /dog will match dog, Dog, DOg, and any other case variation. To disable it: :set noignorecase Add this…
When you modify /etc/sysctl.conf, the changes take effect on the next reboot. To apply them immediately without rebooting, use the sysctl -p command: sudo sysctl -p This reads the configuration file and applies all settings to the running kernel. Reloading Specific Configuration Files By default, sysctl -p reads from /etc/sysctl.conf. You can specify a different…
Working in an SVN repository often leaves behind temporary build artifacts, compiled outputs, and editor cache files. Unlike Git’s git clean command, SVN has no built-in cleanup mechanism for untracked files. Using svn st to Identify Untracked Files The svn status command (or svn st) marks untracked files with a ? prefix. You can leverage…
Directory listing exposes your file structure to visitors and can be a security concern. Apache’s .htaccess file provides a straightforward way to disable this behavior while still allowing direct file access. Basic Implementation Create a .htaccess file in the directory where you want to disable listing: Options -Indexes Place this file in the root directory…
If you’re getting an error like Package subcaption Error: ‘caption’ package not loaded, you need to install the caption package from TeX Live. Quick install For Fedora 41 and later, install the package directly with DNF: dnf install texlive-caption If you’re using an older Fedora version that still has yum, substitute dnf with yum. What…
If you’ve made changes to your working copy but haven’t committed them yet, you can discard them using svn revert. This is useful when you want to abandon edits and go back to the last committed version. Basic Revert To revert all changes in your working copy, run this from the repository root: svn revert…
The wp_list_pages() function is the standard way to display child pages of a page in WordPress. This is useful for building navigation menus, sidebars, or displaying page hierarchies. Basic Implementation Here’s a working example that displays all child pages of the current page: <h3>Pages under <?php the_title(); ?></h3> <div class=”entry”> <ul> <?php wp_list_pages(array( ‘title_li’ =>…
MySQL Cluster uses NDB (Network Database) storage engine to provide high availability and data redundancy across multiple nodes. This guide covers installation and configuration on modern RHEL-compatible systems. Prerequisites Three or more servers (minimum: one management node, two data nodes, one SQL node) Rocky Linux 9 or AlmaLinux 9 Root or sudo access Static IP…
Standard Markdown syntax doesn’t include built-in parameters for image dimensions. The basic syntax  produces images at their original size or constrained by container width, with no way to specify explicit dimensions. If you need to control image size, you have several options depending on your use case and platform. HTML <img> Tag The…
Tracking branches link your local branch to a remote branch, enabling git pull and git push to work without specifying the remote and branch name each time. Here’s how to configure this. The basic command To set an upstream tracking branch for your current branch: git branch –set-upstream-to=origin/branch-name Or the shorter alias: git branch -u…
GNOME uses .desktop files in ~/.config/autostart/ to launch applications when you log in. This mechanism works across GNOME, XFCE, KDE, and most other modern desktop environments. Basic Setup Create a .desktop file in ~/.config/autostart/. Here’s a minimal example: [Desktop Entry] Type=Application Name=My Autostart Script Exec=/home/user/bin/myscript.sh Save this as ~/.config/autostart/myscript.desktop and it will run on your…