Uniswap is the largest Decentralized Exchange (DEX) in crypto, built on a fundamentally different model than traditional trading venues. Instead of maintaining an order book where buyers and sellers match trades, it uses an Automated Market Maker (AMM) — a smart contract that determines prices algorithmically based on liquidity pools. The Liquidity Pool Model Rather…
LibreOffice is the most reliable tool for command-line document conversion, offering robust support for Microsoft Office formats. Install it on Ubuntu/Debian/Linux Mint: sudo apt install libreoffice On Fedora/RHEL systems: sudo dnf install libreoffice For minimal headless-only installations without GUI dependencies: sudo apt install libreoffice-writer libreoffice-calc libreoffice-impress Converting .docx/.doc to .odt LibreOffice runs in headless mode…
macOS provides built-in keyboard modifier remapping without third-party software. Open System Settings → Keyboard → Modifier Keys and you can reassign any modifier key globally or per-device. To map the right Option key to Control: Open System Settings Navigate to Keyboard → Modifier Keys Select your keyboard device (important if you use multiple keyboards) Set…
Linux 5.4.72 is a stable kernel update containing 23 commits and approximately 126,508 lines of code changes compared to the base 5.4 release. This release focuses on critical security and stability fixes across cryptography, filesystem, USB, Bluetooth, and architecture-specific code paths. Cryptography and Security Fixes QAT cipher validation Added length validation for AEAD AES-CBC-HMAC operations…
R is a language and environment for statistical computing and graphics. It’s free software under the GPL license and provides extensive statistical and graphical capabilities through numerous contributed packages. The R environment package is available in Ubuntu’s standard repositories. Install it with: sudo apt update sudo apt install r-base This installs r-base along with recommended…
Accidentally pushing a tag to a remote repository happens frequently. Whether you tagged the wrong commit, used an incorrect version number, or triggered an unintended CI/CD pipeline, you need a clean way to remove it. The Basic Command Delete a remote tag using git push with the –delete flag: git push origin –delete <tagname> For…
Hyperledger Fabric is a modular, enterprise-grade consortium blockchain platform. While its official documentation is comprehensive, deploying a test network from scratch requires configuring multiple dependencies and tools—a process that’s time-consuming for new users. This guide covers both automated and manual setup approaches to get a working Fabric network running quickly. Prerequisites You’ll need: Ubuntu 24.04…
When you need a specific Go version on Ubuntu, the default package manager often lags behind. Production systems like Kubernetes, Hyperledger Fabric, and other projects frequently require versions newer than what’s available in standard repositories. This guide covers system-level installation that allows multiple versions to coexist. Remove existing Go installations Start by cleaning up any…
Gmail requires OAuth2 authentication for SMTP access — direct passwords have been disabled entirely. This is the only supported method for sending mail through Gmail in Thunderbird, whether you’re using a personal or Workspace account. OAuth2 Setup Open Thunderbird and go to Account Settings → Outgoing Server (SMTP). Click Add and configure these settings: Server…
RSA (Rivest–Shamir–Adleman) underpins SSH authentication, TLS certificates, code signing, and encryption across most Linux systems. OpenSSL is the standard tool for generating and managing these keys. Verify OpenSSL Installation OpenSSL is bundled with virtually all distributions. Check your version: openssl version If it’s missing: # Ubuntu/Debian sudo apt-get install openssl # RHEL/CentOS/Fedora sudo dnf install…
If your iPhone feels sluggish after a major iOS update, you’re running into resource contention. Newer iOS versions add features that demand CPU, GPU, and memory cycles. You can’t strip down iOS itself, but you can selectively disable features that drain resources without matching your actual workflow. Disable Haptic Feedback Haptic feedback—the vibrations on every…
Wget is a reliable command-line tool for downloading entire websites for offline viewing, archival, or testing. It preserves the full site structure—HTML, images, CSS, JavaScript—and maintains the original directory layout. Basic Mirroring Command The core command to mirror a website: wget –mirror –convert-links –adjust-extension –page-requisites –no-parent https://example.com Flag Breakdown –mirror: Enables recursive downloading with time-stamping…
By default, rsync connects as your standard user. When you need to write to protected directories like /etc, /var/www, or other root-owned locations, use the –rsync-path option to invoke rsync with sudo privileges on the remote side. Basic syntax rsync -avz –rsync-path=”sudo rsync” local-file user@remote:/protected/path This tells the remote server to execute rsync under sudo….
You opened a system config file in Vim without sudo, made changes, and hit :w to save. Permission denied. Retyping everything isn’t happening. The Solution: :w !sudo tee % From Vim’s normal mode, type: :w !sudo tee % This pipes your buffer through tee running as root: :w — write the current buffer ! —…
Wayland screen recording has matured significantly. Here are the tools that actually work well in 2026, with their tradeoffs and setup. GNOME Built-in Screen Recording GNOME 40+ includes integrated screen recording on Wayland. Press Ctrl+Alt+Shift+R to start. A red dot appears in the top-right corner. Press the same shortcut again or click the indicator to…
Zlib is a foundational open-source compression library implementing the DEFLATE algorithm. It powers gzip, PNG, HTTP compression, and countless applications. While Ubuntu’s package repositories provide pre-built binaries, compiling from source lets you use the latest version, customize the installation path, enable specific compile-time features, and maintain multiple versions simultaneously. This guide covers building zlib on…
Go doesn’t have a dedicated FileExists() function. Instead, use os.Stat() to retrieve file metadata and inspect the error type to determine what actually happened. Basic File Existence Check import “os” func fileExists(path string) bool { _, err := os.Stat(path) return !os.IsNotExist(err) } os.Stat() returns an error only if something goes wrong. The key is using…
When you need additional swap space but all partitions are allocated, creating a swap file lets you add capacity without repartitioning. This is especially useful on systems with fixed disk layouts or cloud instances where you can’t modify the underlying disk structure. Creating the Swap File Start by allocating space. fallocate is the fastest option…
The stat() system call is the traditional approach for checking file existence: #include <sys/stat.h> int file_exists(const char *path) { struct stat buffer; return (stat(path, &buffer) == 0); } This returns 1 if the file exists, 0 otherwise. The stat() call fills the buffer with file metadata, but when checking existence alone, you’re mainly interested in…
On Linux, block special files represent hardware devices like hard drives, SSDs, and other block devices. They’re typically found in /dev and can be identified using Python’s stat module combined with os.stat(). The Standard Approach import os import stat path = “/dev/sda” try: mode = os.stat(path).st_mode if stat.S_ISBLK(mode): print(f”{path} is a block device”) except FileNotFoundError:…