Shell & Coin Blog
Every Linux guide, crypto explainer and review we have published, newest first.
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Bitcoin Lightning Network Explained: The Fast Bitcoin Payment Layer
Learn how the Bitcoin Lightning Network enables instant, low-fee Bitcoin payments off-chain. How payment channels work, real uses, pros, cons, and how to start.
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How to Edit the Sudoers File in Linux: Manage sudo Permissions Safely
Learn how to edit the sudoers file in Linux using visudo, grant precise sudo permissions, use NOPASSWD, and avoid common misconfigurations that lock you out.
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What Is Polkadot (DOT) Crypto: The Multi-Chain Network Explained
Polkadot (DOT) connects blockchains through parachains and a relay chain. Learn how it works, how to stake DOT, and why it ranks top-33 crypto in 2026.
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How to Use fdisk in Linux: Partition Disks the Right Way
Learn how to use fdisk in Linux to create, delete, and manage disk partitions. Step-by-step guide covering mkfs, fstab, and partition best practices.
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What Is Polygon (POL) Crypto: Ethereum’s Scaling Solution Explained
Polygon (POL) is Ethereum's top scaling solution. Learn how it cuts fees to pennies, handles billions of transactions, and why Mastercard uses it.
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How to Install Let’s Encrypt on Linux with Certbot (Step-by-Step)
Learn how to install Let's Encrypt SSL on Linux with Certbot for Nginx. Get a free certificate, set up auto-renewal, and secure your server in minutes.
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How Do Bonds Work: The Investment I Finally Stopped Ignoring
Learn how bonds work: types, yields, risks, and how they fit your portfolio. A plain-English explainer from someone who ignored bonds way too long.
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What Is a Bitcoin ETF: How It Works and Why It Changed Crypto Forever
Spot Bitcoin ETFs crossed $100B in AUM. Here is exactly how a Bitcoin ETF works, the difference from owning BTC, and when it makes sense for you.
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Best Text Editor for Linux in 2026: I Tested 5 (One Replaced My IDE)
I tested 5 popular Linux text editors — Nano, Vim, Neovim, VS Code, and Emacs — so you don't have to. Here's what sysadmins actually need in 2026.
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What Is Chainlink (LINK): The Oracle Network Every Crypto Investor Needs to Know
What is Chainlink (LINK)? Learn how this decentralized oracle network powers DeFi, secures $95B+ in value, and why LINK matters for every crypto investor.
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How to Use GPG in Linux: Encrypt, Sign, and Manage Keys
Learn how to use GPG in Linux to encrypt files, sign data, and manage keys. Complete command guide with real examples for sysadmins and beginners.
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Best Crypto Hardware Wallet in 2026: I Tested 4 So You Don’t Have To
I tested the top crypto hardware wallets in 2026. Here's which ones actually protect your portfolio — and the one I keep recommending to friends.
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What Is Impermanent Loss in DeFi (And Why 54% of Liquidity Providers Lose Money)
What is impermanent loss in DeFi? Learn how it silently eats liquidity provider profits, the math behind it, and how to protect yourself in 2025.
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How to Use openssl in Linux: The Command Every Sysadmin Needs
Learn how to use the openssl command in Linux for certificate inspection, key generation, SSL testing, and file encryption. Complete sysadmin guide with examples.
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What Is Bitcoin Halving: How It Works and Why It Matters for Your Portfolio
What is Bitcoin halving? Learn how it works, the history of each event since 2012, its price impact, and what the 2028 halving means for your crypto portfolio.
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How to Use rsync in Linux: Sync Files Locally and Remotely
Learn how to use rsync in Linux to sync files locally and remotely over SSH. Covers options, examples, automation with cron, and common mistakes to avoid.
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What Is Elliott Wave Theory in Crypto Trading (The Pattern That Predicted Bitcoin’s 2018 Crash)
Learn what Elliott Wave Theory is and how impulse and corrective waves work in crypto trading. The 3 hard rules, Fibonacci ratios, and how to apply it.
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What Is RWA in Crypto: Real World Assets Tokenization Explained
Real world assets (RWA) in crypto are changing finance. Learn what RWA tokenization is, how it works, and why BlackRock and major banks are all in.
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How to Use Cron Jobs in Linux: Schedule and Automate Tasks
Learn how to use cron jobs in Linux with crontab syntax, real-world examples, output logging, and troubleshooting tips. Automate tasks like a pro sysadmin.
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What Is Avalanche Crypto (AVAX): Speed, Subnets, and Why It Matters
What is Avalanche crypto (AVAX)? Learn how subnets, sub-second finality, and BlackRock adoption make AVAX one of the most interesting blockchains in 2026.
