Practical Linux Tutorials and Command-Line Guides

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

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Oct 17, 2026 • 11 min read

SSH Permission Denied (publickey): Causes and Fixes

Fix SSH "Permission denied (publickey)" on Linux: what the method list means, key permissions and ownership, passphrase issues, server settings, and logs.

Use SCP Command to Securely Transfer Files

Sep 23, 2026 • 10 min read

scp Command in Linux: Secure File Transfer Examples

SCP copies files securely between local and remote hosts over SSH. This guide covers syntax, uploads, downloads, custom ports, and the options you need for everyday transfers.

Mar 9, 2026 • 7 min read

Find and Replace in Vim / Vi

Step-by-step guide to finding and replacing text in Vim using the :substitute command. Covers ranges, flags, regex, case sensitivity, and practical examples.

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Oct 24, 2026 • 10 min read

How to Install and Use Ollama on Ubuntu 26.04 and 24.04

Set up Ollama on Ubuntu 26.04 or 24.04 with the official script, run Llama 3.2 locally, manage models, check GPU use, and call the local API.

Install Ollama on Ubuntu to run large language models locally

Oct 24, 2026 • 12 min read

How to Copy, Cut and Paste in Vim / Vi

Copy, cut, and paste in Vim with yank, delete, and put commands. Includes copying to the system clipboard, the unnamedplus setting, and OSC 52 over SSH.

Oct 23, 2026 • 5 min read

How to Check the Kernel Version in Linux

Run uname -r to print the running Linux kernel version. This guide also covers hostnamectl, /proc/version, listing installed kernels, and spotting a pending reboot.

Check the Linux kernel version from the command line

Oct 23, 2026 • 12 min read • new

How to Install Pi-hole on Ubuntu: Network-Wide Ad Blocker

Install Pi-hole on Ubuntu, configure your router or clients to use it for DNS, and verify ad blocking. Includes Pi-hole v6 setup and troubleshooting.

Pi-hole filtering unwanted DNS requests before they reach devices on a home network

Oct 23, 2026 • 11 min read

locate Command in Linux: Find Files Quickly

The locate command finds files by name in a fraction of a second by searching a prebuilt index. Covers plocate, updatedb, exact name matches, and regex.

Terminal showing locate command search results for files in Linux

Oct 22, 2026 • 8 min read

How to Install Docker on Debian 13 (Trixie)

Install Docker on Debian 13 from the official Docker repo. Set up the apt keyring, install Engine and Compose plugin, and fix common errors.

Oct 22, 2026 • 6 min read

How to Check Your Debian Version: Commands and Release List

Debian 13 (trixie) is the current stable release. Check your version with /etc/os-release, lsb_release, or hostnamectl, plus codenames and support dates.

Oct 21, 2026 • 13 min read

Debian vs Ubuntu Server: Which One Should You Use?

Debian 13 vs Ubuntu Server 26.04 LTS: release cycles, support windows, package versions, install defaults, security, and cloud support compared side by side.

Oct 21, 2026 • 6 min read • new

Debian Versions: Release History, Codenames, and Support Dates

Debian versions from Buzz to Trixie, with release dates, codenames, and support timelines. Compare stable, testing, unstable, LTS, and paid ELTS coverage.

Archive dividers labeled with Debian versions 11, 12, 13, and 14, with version 13 highlighted in teal

Oct 21, 2026 • 9 min read • series

How to Compare Strings in Bash

Bash string comparison using equal, not equal, regex, and pattern matching operators. Includes examples for empty strings, case-insensitive matching, and substrings.