The diff utility generates unified diffs that show changes between file versions. Always use the -u flag to create unified diffs, which are the standard format for patches. For a single file: diff -u original.c new.c > fix.patch For an entire directory tree: diff -rupN original/ new/ > patchfile.patch The flags break down as: -r:…
The mupdf package is available in most major Linux distributions. On RHEL/CentOS/Fedora: sudo dnf install mupdf mupdf-tools On Debian/Ubuntu: sudo apt install mupdf On Arch: sudo pacman -S mupdf mupdf is a lightweight, fast PDF and XPS viewer written in C. It’s significantly faster than heavier alternatives like Evince or Okular, making it ideal for…
Xen remains in production use across cloud providers (AWS EC2, Citrix Hypervisor) and large infrastructure deployments, though KVM has become the default hypervisor for most Linux distributions. This guide covers installing a Fedora Domain-U on a Xen Dom0 using PXE boot, applicable to current Fedora releases. Prerequisites A working Xen Dom0 installation LVM backing store…
Modern Fedora (29+) uses firewalld by default instead of the legacy iptables service. If you’re working with an older system or one configured for iptables, the concepts here still apply, but you should first check what’s actually managing your firewall: systemctl status firewalld systemctl status iptables If firewalld is active, use firewall-cmd instead. For iptables-based…
Fedora switched to systemd for service management years ago, replacing the traditional /etc/inittab file with a target-based system. While systemctl set-default is the standard approach, understanding the manual method gives you insight into how systemd actually manages boot targets. Systemd Targets vs. Legacy Runlevels Systemd uses targets instead of runlevels. The two primary targets you’ll…
The startx command launches an X session without a display manager, reading configuration from $HOME/.xinitrc. By default, this file doesn’t exist—startx falls back to system defaults that typically only recognize GNOME or KDE. If you’ve installed MATE and want to use it with startx, you need to create a user-level configuration. Understanding startx Initialization When…
If your Linux machine is getting noticeably slower WiFi speeds than other devices on the same network, MTU (Maximum Transmission Unit) misconfiguration can be a culprit. While MTU tuning won’t be the answer in every case, it’s worth investigating if you’re seeing symptoms like high latency, dropped packets, or intermittent connection issues. Understanding MTU MTU…
Copying text to a file is a common operation on Linux, and there are several approaches depending on your workflow. Opening an editor like vim or nano works fine, but for quick pastes there are faster methods worth knowing. The Quick Clipboard Method If you have text copied to your clipboard, the fastest way to…
Xen remains relevant for certain production workloads, particularly in cloud infrastructure (AWS EC2, Citrix Hypervisor) and enterprise environments requiring strong VM isolation. However, most Linux distributions now default to KVM for virtualization due to simpler setup and broader ecosystem support. If you’re evaluating hypervisors, consider KVM or container-based solutions like Podman and Kubernetes for new…
Modern Linux systems use GRUB2 as the bootloader. You’ll set the default boot entry either through the configuration file or via command-line tools. View Available Boot Entries First, list all available GRUB2 menu entries: grep ^menuentry /etc/grub2.cfg | cut -d “‘” -f2 On UEFI systems, use /etc/grub2-efi.cfg instead. If you’re unsure which mode your system…
If you need to work with Office files (.doc, .docx, .xls, .ppt) on Linux, Wine can run Microsoft Office 2007, though this approach has largely been superseded by cloud-based alternatives and native Linux tools. That said, for specific compatibility requirements, here’s how to set it up. Install Wine First, install Wine. Most distributions now package…
IPv6 is enabled by default on most Linux distributions. While IPv6 adoption has grown, there are legitimate reasons to disable it: some legacy applications don’t handle dual-stack networks well, it can complicate firewall rules, or you might be operating in an environment that doesn’t support it. Disabling IPv6 requires kernel-level configuration through sysctl. Using sysctl…
Dropping file system caches reclaims memory for applications. Linux kernels 2.6.16+ provide a /proc/sys/vm/drop_caches interface to trigger cache eviction. This is safe — the kernel only frees clean cache pages and unreferenced inodes/dentries. Dirty data stays in memory until explicitly synced to disk. Two-Step Cache Drop Process Step 1: Sync Dirty Data to Disk Before…
Every file on Linux consumes an inode. When you exhaust your inode allocation, you can’t create new files even if disk space remains. This is a real constraint on systems handling millions of small files—email servers, web caches, log rotators, container registries. Quick inode checks Check overall filesystem inode usage: df -i This shows inodes…
Start by identifying your optical drive device. List your CD/DVD drives: ls -l /dev/cdrom This typically shows a symlink to your actual device: lrwxrwxrwx. 1 root root 3 Aug 1 17:00 /dev/cdrom -> sr0 You can also check active optical drives with lsblk: lsblk | grep -i rom Modern systems may use /dev/sr0, /dev/sr1, etc….
Vim is an excellent choice for email composition, and KMail makes it straightforward to use as your external editor. This setup is particularly useful if you already live in Vim and want consistent keybindings across your workflow. KMail’s External Editor Configuration KMail has built-in support for external editors. Navigate to Settings → Configure KMail →…
MPlayer reached end-of-life years ago. Use mpv instead — it’s the actively maintained fork with better codec support, performance, and a cleaner codebase. Most MPlayer DVD commands work in mpv with minimal syntax changes. mpv plays DVDs in multiple formats: physical disks, ISO files, or extracted DVD directories (copied directly from a disk). Basic mpv…
KDE Plasma 6 provides straightforward touchpad configuration through the graphical Settings interface, with optional command-line customization for advanced cases. GUI Configuration Navigate to System Settings → Input Devices → Touchpad. You’ll find the “Tap to Click” toggle under the “Tapping” section. Enable it to map single-finger taps to left-button clicks. Additional options here include: Tap-and-drag:…
Network speed varies dramatically across connection types. Here’s a practical breakdown of real-world performance across different technologies, using actual test data and modern measurement approaches. Historical Context and Modern Relevance While 2G and 3G networks are largely deprecated in most developed regions by 2026, understanding their performance characteristics remains relevant for: Legacy system maintenance in…
Starting with Linux can feel intimidating. The terminology, the command line, the endless configuration options—it’s a lot. But that initial confusion fades quickly. Once you get comfortable with the fundamentals, Linux becomes intuitive, and you’ll wonder why you didn’t start sooner. This guide points you toward solid tutorials that cover the essentials without overwhelming you….