Linux Inside: The Ideal Blog for Sysadmins & Geeks

🚀 Pro TecMint now has 16 Linux courses live! 🟢 Beginner: Learn Linux in 7 Days → pro.tecmint.com/learn-linux/ 100+ Essential Linux Commands → pro.tecmint.com/linux-commands… 11 Best Linux Distributions → pro.tecmint.com/best-linux-dis… Linux Interview Handbook → pro.tecmint.com/linux-intervie… SSH Complete Course → pro.tecmint.com/ssh-complete-c… 🔵 Advanced: AI for Linux → pro.tecmint.com/ai-for-linux/ Bash Scripting → pro.tecmint.com/learn-bash-scr… Ubuntu Handbook → pro.tecmint.com/ubuntu-handboo… Linux Performance Monitoring → pro.tecmint.com/linux-monitori… Golang for DevOps → pro.tecmint.com/learn-go/ Claude for Linux → pro.tecmint.com/claude-code-fo… 🏆 Certifications: RHCSA → pro.tecmint.com/rhcsa-certific… RHCE → pro.tecmint.com/rhce-certifica… LFCS → pro.tecmint.com/lfcs-certifica… LFCA → pro.tecmint.com/lfca-certifica… All courses included in the Root plan at $8/month or $59/year. Lifetime access at $199 one-time. 👉 pro.tecmint.com #Linux #SysAdmin #DevOps

In Chapter 21 of our #ClaudeCode for #Linux course, you'll connect Claude Code to the GitHub MCP server, then use it for pull request reviews, issue triage, and correlating commits with service incidents. Read the chapter: pro.tecmint.com/connect-claude… Follow @tecmint for a new chapter every week.

Still wondering which Node.js framework to choose for your next web application? Explore 17 of the best Node.js frameworks, including Express, Fastify, NestJS, Hono, Koa, Strapi, and more. Learn what each framework offers, where it works best, and how to choose the right one for your project. Read: tecmint.com/best-nodejs-fr… Follow @tecmint for more #Linux, #NodeJS, #JavaScript, #WebDevelopment, #Programming, and #OpenSource tips.

Tired of Go tutorials that teach syntax but leave you clueless when it's time to build real tools? I wrote a book where you build 7 DevOps projects: GitHub tools, task manager, HTTP server, system monitor, and more. The goal is simple: learn Go by building real things. tecmint.gumroad.com/l/golang-devops #golang #devops #linux

In Chapter 46 of our SSH course, you'll learn how to secure SSH with hardware security keys using YubiKey, FIDO2, and ed25519-sk. You'll generate hardware-backed SSH keys, configure secure authentication, use resident keys and PIN protection, and require physical presence for every login. Read it here → pro.tecmint.com/ssh-hardware-s… Follow @tecmint for new #SSH chapters every week.

Still fixing broken wikilinks, Base files, or Canvas layouts after your AI edits your Obsidian vault? obsidian-skills teaches AI coding agents like Claude Code, Codex, and OpenCode how Obsidian actually works. It enables them to create proper wikilinks, understand Bases and Canvas files, respect Obsidian Markdown, and even extract clean Markdown from web pages with the Defuddle skill. Read: tecmint.com/obsidian-skill… Follow @tecmint for more #Linux, #OpenSource, #AI, and #Obsidian tips.

MySQL is running slow, and you don't know why. These 6 CLI tools show you exactly what's happening - slow queries, thread spikes, buffer pool issues, all from the terminal. 👉 tecmint.com/mysql-performa… Follow @tecmint for more #Linux and #SysAdmin tips.

Want to learn more about the sort command beyond the basics? Check out Lesson 31: sort Command in Linux, part of our 100+ Essential Linux Commands course. pro.tecmint.com/sort-command-i…

💡 Quick Linux Tip #52 You have data in separate files and want to combine them side by side. Run: paste file1 file2 For example: paste name.txt age.txt This combines matching lines from both files into a single output. You can also try: paste users.txt emails.txt paste cities.txt countries.txt paste file1.txt file2.txt Perfect for merging related data, comparing files, or creating simple reports. Follow @tecmint for more #LinuxTips

In Chapter 20 of our #ClaudeCode for #Linux course, you'll learn what the Model Context Protocol (#MCP) is, why it matters, and how it enables Claude Code to connect with tools like GitHub, internal documentation, databases, and monitoring systems. Read the chapter: pro.tecmint.com/understanding-… Follow @tecmint for a new chapter every week.

In Chapter 45 of our SSH course, you'll learn how to secure SSH with Multi-Factor Authentication (MFA) using Google Authenticator, TOTP, and PAM. You'll configure two-factor authentication, test your setup, troubleshoot common issues, and apply MFA to specific users or groups for stronger server security. Read it here → pro.tecmint.com/ssh-multi-fact… Follow @tecmint for new #SSH chapters every week.

Still opening separate terminal tabs for OpenCode, Claude, and other AI coding tools? OpenCode is a terminal-based AI coding agent that can read an entire project, analyze code, debug issues, and apply changes directly from your terminal. It works with real codebases, supports multiple AI providers, and lets you review every change before it's written to disk. Read: tecmint.com/opencode-ai-co… Follow @tecmint for more #Linux, #OpenSource, and #AI tips.

Running out of disk space, but can’t find the files? You’re likely dealing with hidden usage from deleted files still open by running processes. That’s why df and du don’t match. How to find it: tecmint.com/df-du-disk-usa… Follow @tecmint for more #Linux and #SysAdmin tips.

Want to learn more about the 'Linux' command beyond the basics? Check out our 100+ Essential Linux Commands course. pro.tecmint.com/linux-commands…

💡 Quick Linux Tip #51 A file is too large, and you want to break it into smaller files. Run: split -l 100 filename For example: split -l 100 names.txt Suppose `names.txt` contains 250 lines. The command above will split the file into smaller files with 100 lines each. The split files will be: xaa - Lines 1–100 xab - Lines 101–200 xac - Lines 201–250 To verify the number of lines in each file, run: wc -l x* Perfect for sharing large files, processing huge datasets, or breaking logs into manageable chunks. Follow @tecmint for more #LinuxTips

Copying a 50GB file and have no idea when it'll finish? Linux has better tools for large files and million-file directories than most sysadmins use daily. Real examples inside: tecmint.com/copy-large-fil… Follow @tecmint for more #Linux and #SysAdmin tips.

Want to learn more about the tr command beyond the basics? Check out Lesson 30: tr Command in Linux, part of our 100+ Essential Linux Commands course. pro.tecmint.com/tr-command-in-…

💡 Quick Linux Tip #50 You want to replace or convert characters in text. Run: tr 'a-z' 'A-Z' For example: echo "hello linux" | tr 'a-z' 'A-Z' This converts all lowercase letters to uppercase. You can also use: echo "HELLO" | tr 'A-Z' 'a-z' echo "linux" | tr 'a-z' 'A-Z' echo "a,b,c" | tr ',' ' ' Perfect for changing letter case, replacing characters, and transforming text directly from the command line. Follow @tecmint for more #LinuxTips

In Chapter 19 of our #Claude Code for #Linux course, you'll build a practical log-analysis Skill that automatically scans Linux logs, detects important error patterns, filters out noise, prioritizes issues by severity, and generates a structured report with actionable next steps. Read the chapter: pro.tecmint.com/create-log-ana… Follow @tecmint for a new chapter every week.

Want to learn more about the 'uniq' command beyond the basics? Check out Lesson 32: uniq Command in Linux, part of our 100+ Essential Linux Commands course. pro.tecmint.com/uniq-command-i…

💡 Quick Linux Tip #49 A file contains duplicate lines, and you want to remove them. Run: uniq filename For example: uniq names.txt This removes consecutive duplicate lines. For best results, sort the file first: sort names.txt | uniq You can also try: sort users.txt | uniq sort fruits.txt | uniq -c sort logs.txt | uniq What these do: sort users.txt | uniq - Shows only unique lines sort fruits.txt | uniq -c - Counts how many times each line appears sort logs.txt | uniq - Removes duplicate log entries Perfect for cleaning up lists, counting duplicates, or finding unique entries. Follow @tecmint for more #LinuxTips