GitBook is a tool for building documentation and ebooks from Markdown content. Here’s how to set it up on a Linux system. Prerequisites You’ll need Node.js installed first. On Ubuntu/Debian: curl -fsSL https://deb.nodesource.com/setup_20.x | sudo -E bash – sudo apt-get install -y nodejs On Fedora/RHEL: sudo dnf install nodejs Verify the installation: node –version npm…
Node.js installation on Ubuntu and Linux Mint has evolved significantly. The approach depends on your use case — whether you need the latest stable version, multiple Node versions for different projects, or just a quick setup. Using the NodeSource Repository (Recommended) The NodeSource repository provides current, well-maintained Node.js packages. This is the best approach for…
When GitBook or other tools call Calibre’s ebook-convert command on a headless server, you’ll hit this error: RuntimeError: X server required. If you are running on a headless machine, use xvfb This happens because Calibre needs an X11 display server, even though you’re just converting files. The solution is to wrap ebook-convert with xvfb-run, which…
Xen VMs sometimes log cryptic kernel messages about fragmentation that indicate a mismatch between the VM’s network driver and the host’s virtual interface settings: kernel netfront: Too many frags skb rides the rocket These errors occur when the guest kernel’s netfront driver tries to send packets with more fragments than the backend can handle, or…
By default, Thunderbird only checks the Inbox folder for new messages when using IMAP accounts. If you receive emails that bypass your Inbox or use multiple folders for organization, you’ll want to enable checking across all IMAP folders. Method 1: Using the Config Editor (Recommended) The most direct approach is to modify Thunderbird’s configuration through…
If you’re syncing emails with tools like offlineimap, you might notice a problem: when an email is deleted from the server, it’s also deleted locally. That’s by design—offlineimap performs synchronization, not backup. For actual backups, you need a tool that retrieves emails without deleting the originals. This post covers the best approaches in 2026. getmail:…
When you start a QEMU guest without explicitly configuring VNC, the display server may not bind to an address your VNC client can reach. You’ll see an error like: vncviewer: ConnectToTcpAddr: connect: Connection refused Unable to connect to VNC server This happens because QEMU defaults to SDL display output and doesn’t automatically expose VNC to…
BuddyPress themes extend WordPress’s community features with member profiles, activity streams, and group functionality. While any modern WordPress theme technically works with BuddyPress, dedicated BuddyPress themes provide optimized templates and styling out of the box. Finding BuddyPress Themes Several repositories host BuddyPress-compatible themes: WordPress.org Theme Directory — Filter by the “buddypress” tag at wordpress.org/themes/ Third-party…
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…
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…
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…
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…
Git branching is fundamental to modern development workflows. A branch is a lightweight pointer to a commit that lets you work on multiple features, fixes, or experiments in parallel without affecting the main codebase. Understanding branching well is essential for team collaboration and maintaining a clean project history. Creating and Switching Branches Create a new…
IBus daemon restarts aren’t always straightforward in GNOME, especially since menu options have been removed. You’ll need to kill the daemon and start a fresh one. Quick restart Kill the current IBus daemon: pkill -o ibus-daemon The -o flag terminates only the oldest process, which is typically the main daemon (not child processes). IBus usually…
X11 forwarding lets you run Chrome on a remote host and display it on your local machine. It’s quick to set up for occasional use, but for regular work or modern Linux systems, you’ll want to know when to use alternatives. Basic X11 Forwarding The simplest approach uses SSH’s X11 forwarding: ssh -X username@remote_host google-chrome…
If you’ve pushed a commit with a bad message, you can fix it—but the approach depends on whether others have pulled that commit yet. When Rewriting Is Safe Only amend and force-push if: You’re the only one using the repository You’re absolutely certain no one else has pulled the commit yet Your branch protection rules…
Chrome aggressively caches HTTP redirects—especially 301 (permanent) and 308 redirects—as a performance optimization. The cache persists across browser sessions, which causes real problems when you’ve updated redirect rules and need to test them immediately. Understanding Chrome’s Redirect Cache Behavior Chrome stores redirect information at the browser level, separate from typical page caches. This means: 301…
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…
You can fetch a webpage as if you’re requesting from a mobile device by setting curl’s User-Agent header to match a mobile browser. Remote servers use the User-Agent header to decide whether to serve mobile or desktop versions of pages. Basic syntax Use the -A (or –user-agent) flag to specify a mobile User-Agent string: curl…
The built-in etags command doesn’t recursively traverse directories by default, but generating TAGS files across your entire project is straightforward with the right tools and setup. Using ctags (Recommended) The simplest approach is ctags with the -e flag, which generates Emacs-compatible TAGS files: ctags -e -R . The -R flag enables recursive traversal. This works…