Practical Linux Tutorials and Command-Line Guides

Search hundreds of step-by-step tutorials for Bash, Ubuntu, networking, security, and more.

Featured Articles

Installing the Claude Code AI coding assistant in a Linux terminal on Ubuntu

Jul 6, 2026 • 6 min read

How to Install Claude Code on Ubuntu and Linux

Install Claude Code on Ubuntu, Debian, and other Linux distributions using the recommended native installer, official package-manager repositories, or npm.

Oct 5, 2026 • 9 min read

chown Command in Linux: Change File Ownership

Use the chown command in Linux to change file and directory ownership, including recursive changes, symbolic links, and practical ownership examples.

Oct 20, 2026 • 8 min read

gzip Command in Linux

Compress and decompress files with the gzip command in Linux. Covers keeping originals, compression levels, directories, listing, and testing .gz files.

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Nov 3, 2026 • 8 min read • series

passwd Command in Linux: Change User Passwords

Change your own, another user's, or the root password in Linux with the passwd command. Covers password expiry with chage, forcing a change at next login, and account locking.

Nov 3, 2026 • 11 min read

Linux Folder Size: How to Check File and Directory Sizes

Check folder and file sizes in Linux with du. Compare directory totals, rank subdirectories, exclude paths, and check free space with df.

Nov 3, 2026 • 8 min read

How to Use OpenSSL: Generate Keys, Certificates, and Test TLS

Practical OpenSSL guide for Linux: generate private keys, create CSRs and self-signed certificates, convert formats, inspect certificates, and test TLS connections.

Generating keys and certificates with OpenSSL in a Linux terminal

Nov 3, 2026 • 9 min read • new

How to Generate a Random Password or String in Linux

Generate random passwords and strings in Linux with openssl rand, /dev/urandom, pwgen, and Python. Choose hex, Base64, URL-safe tokens, or passphrases.

A terminal command producing a random string beside a small padlock

Nov 2, 2026 • 7 min read

How to Install Java on Ubuntu 26.04

Install OpenJDK 25, the Ubuntu 26.04 default, or Oracle JDK 25 and 27. Also covers other OpenJDK versions, switching between them, and JAVA_HOME.

Nov 2, 2026 • 8 min read

apt vs apt-get: The Difference and When to Use Each

apt and apt-get are not the same tool: apt is built for interactive terminal use, apt-get for scripts and automation. Compare their commands and see when to use each.

Nov 2, 2026 • 8 min read • new • series

Fix SSH "Too Many Authentication Failures" Error

Fix SSH 'Too many authentication failures' by selecting the right key with IdentitiesOnly, skipping keys for password login, and checking MaxAuthTries.

A mint SSH key selected from several unused keys and pointed toward a server keyhole

Nov 1, 2026 • 4 min read

How to Change a Git Remote's URL

Change a Git remote URL with git remote set-url, switch between HTTPS and SSH, set separate push and fetch URLs, and verify the change.

Nov 1, 2026 • 7 min read

Python Switch Case Statement (match-case)

Learn how to use Python's match-case statement (structural pattern matching) as a switch-case equivalent. Covers if-elif-else, dictionary lookup, and match-case with examples.

Nov 1, 2026 • 6 min read • new

Fix "npm ERR! Missing Script: dev"

npm run dev fails with 'Missing script: dev' when package.json has no dev key. Find the script the project actually uses, or add one that starts its dev server.