GPT (GUID Partition Table) is required for disks larger than 2TB. The older MBR format maxes out at 2.2TB due to 32-bit sector addressing. Tools like fdisk will refuse to work properly with large drives and recommend switching to GPT. While parted has a steeper learning curve than some alternatives, it’s the standard for GPT…
The traditional fork-exec pattern works, but it’s error-prone. posix_spawn() handles process creation in a single call with several advantages: Atomic operation: Spawn and exec happen atomically, eliminating race conditions between fork and exec No fork quirks: You don’t need conditional logic for parent vs. child code paths — exec happens immediately in the child Direct…
Hadoop 2.x reached end-of-life in 2016. This guide covers setup for learning purposes and legacy system maintenance only. For production deployments, use Hadoop 3.x or later, which includes performance improvements, better YARN scheduling, HDFS erasure coding, and improved security. Cloud-managed options like AWS EMR, Google Dataproc, and Azure HDInsight eliminate most operational overhead. This guide…
You’ve got internal hosts on RFC 1918 addresses (10.0.3.0/24, 172.16.0.0/12, etc.) behind a gateway, and you need SSH access to them from your workstation. Traditional solutions involve iptables port forwarding, non-standard ports, and a maintenance nightmare. ProxyCommand offers a cleaner approach: direct SSH connections to internal IPs that actually work. How ProxyCommand Works SSH’s ProxyCommand…
SSH performance is constrained by cipher choice, especially for large file transfers over high-bandwidth links where CPU becomes the bottleneck. Selecting the right cipher, key exchange algorithm, and compression settings can yield substantial throughput improvements. Current Cipher Landscape Modern OpenSSH (7.4+) has deprecated or removed weak ciphers. Here’s what’s viable today: Secure and performant: chacha20-poly1305@openssh.com…
Emacs startup is slow. If you’re using it for quick edits alongside other tools, waiting 2-3 seconds every time becomes friction. Heavy mode configurations, lazy loading chains, and initialization hooks add up fast. The server/client architecture solves this: start an Emacs server once, then spawn lightweight clients that connect almost instantly. Your first edit waits…
GNOME’s default Settings app doesn’t expose comprehensive font options, but GNOME Tweaks and command-line tools give you full control over typefaces across the desktop, shell, and window decorations. Installing GNOME Tweaks GNOME Tweaks is the easiest way to customize fonts. Install it on your system: Fedora: sudo dnf install gnome-tweaks Debian/Ubuntu: sudo apt install gnome-tweaks…
Vim remains one of the most efficient editors available on Linux and Unix systems. While it has a steep learning curve, the payoff in speed and capability is substantial once you develop muscle memory. This guide covers practical configuration strategies, essential keybindings, and workflow improvements that actually matter in daily use. Setting up your configuration…
Gitolite provides fine-grained access control over Git repositories without the overhead of a full-featured platform. It uses SSH keys for authentication and handles per-user, per-repository, and even per-branch permissions through a simple configuration file. This guide covers a working installation on modern Linux distributions. Prerequisites Server: Linux (Ubuntu 20.04 LTS or later, Debian 11+, RHEL/Rocky…
VNC provides graphical remote access to Linux servers. For security, tunnel VNC traffic through SSH rather than expose it directly to the network. This guide covers Windows client setup with SSH tunneling. Prerequisites Windows client: SSH client: Native OpenSSH (built into Windows 10/11) or PuTTY VNC viewer: RealVNC Viewer, TigerVNC Viewer, or TightVNC Viewer Linux…
Vim’s default OCaml indentation is mediocre at best. The ocp-indent tool provides intelligent, syntax-aware indentation that respects OCaml conventions and integrates cleanly with Vim and Neovim. Installing ocp-indent Install via opam: opam install ocp-indent This installs the indentation engine and Vim plugin support. Verify the installation: which ocp-indent Configuring Vim Add this to your ~/.vimrc…
The proprietary fglrx driver reached end-of-life in 2015 and is incompatible with current Fedora releases. For modern AMD GPUs, use AMDGPU—AMD’s actively maintained open-source driver that supports Wayland, current kernel versions, and both desktop and compute workloads. GPU Compatibility RDNA and newer (RX 5000 series and later): AMDGPU is required and fully supported. GCN-era Radeons…
When /etc/fstab contains errors or your hardware configuration changes, the system may fail to boot or hang during the mount phase. You can recover by modifying kernel parameters at boot time to bypass automatic mounting, then repair the configuration. Method 1: Boot to Single-User Mode Single-user mode skips mounting filesystems listed in fstab, letting you…
The passwd command is designed for interactive use—it prompts for input rather than accepting passwords via stdin by default. When you need to set passwords programmatically (bulk user provisioning, CI/CD automation, remote administration), you need methods that bypass the interactive prompt. Using passwd with –stdin The –stdin flag tells passwd to read the new password…
Ubuntu locks the root account by default as a safety measure—it prevents accidental system damage and enforces audit trails through sudo. If you genuinely need direct root access, here’s how to enable it and the security tradeoffs involved. Set a root password The simplest approach: sudo passwd root You’ll be prompted to enter and confirm…
xclip is a utility that bridges the command line and X11 selections, letting you pipe command output directly to your clipboard. It’s indispensable for workflows where you’re generating content in the terminal and pasting it elsewhere—whether that’s a browser, text editor, or another application. Installation On Fedora/RHEL-based systems: sudo dnf install xclip On Debian/Ubuntu: sudo…
On most distributions: # Debian/Ubuntu sudo apt install xvkbd # Fedora/RHEL sudo dnf install xvkbd # Arch sudo pacman -S xvkbd xvkbd is an X11 tool for sending keyboard and mouse input to the focused window. It’s lightweight and useful for straightforward automation tasks, but has significant limitations that make it unsuitable for critical workflows….
Running an SSH server on Windows enables remote administration, port forwarding, and integration with Unix-like workflows. Modern Windows provides native OpenSSH support that’s far superior to legacy third-party solutions. Installation Windows 10 (build 1809+), Windows 11, and Windows Server 2019+ include OpenSSH as an optional feature. Via Settings: Open Settings → System → Optional features…
Bash has no native floating point support. The (( )) and $(( )) arithmetic expansions only handle integers. For decimals, you need external tools — primarily bc, awk, or dc. bc: Arbitrary Precision Calculator bc is the standard choice for floating point math in shell scripts. It’s POSIX-compliant, available on every Unix-like system, and handles…
Make is a build automation tool that reads configuration files (makefiles) to compile programs and manage project workflows. It’s been a standard in Unix/Linux development for decades and remains essential for managing builds where dependencies matter. Make works by defining targets and their dependencies, then specifying commands to build each target. When you run make,…