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 19, 2026 • 11 min read

Netcat (nc) Command in Linux with Examples

Netcat (nc) command examples for Linux: check a port with nc -zv, scan port ranges, open listeners, transfer files, and set timeouts with -w.

Aug 8, 2026 • 7 min read

How to Show Line Numbers in Vim and Vi

Turn on line numbers in Vim or Vi for the current session, set them by default in .vimrc or init.lua, and switch between absolute, relative, and hybrid numbering.

Sep 26, 2026 • 10 min read

Using the SSH Config File

Set up the SSH client config file to manage multiple remote connections with custom hostnames, users, ports, keys, and jump hosts, all without long command-line flags.

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Nov 8, 2026 • 6 min read

How to Use the pkill Command in Linux

The pkill command sends signals to Linux processes by name, user, terminal, or full command pattern. Covers safe matching, common options, and examples.

Nov 8, 2026 • 4 min read

How to Set or Change Timezone on Ubuntu Server and Desktop

Check the current time zone on Ubuntu and change it permanently with timedatectl, or switch it from the Date & Time panel on Ubuntu Desktop.

Nov 8, 2026 • 8 min read

pgrep Command in Linux: Find and Filter Running Processes

The pgrep command finds running processes by regex pattern, user, terminal, or parent PID and prints matching PIDs. This guide covers exact matching, filtering options, and script-friendly exit checks.

Using the pgrep command to find running process IDs in Linux

Nov 7, 2026 • 9 min read • series

The ~/.ssh Folder: Files, Permissions, and Layout

What lives inside ~/.ssh on Linux: private keys, authorized_keys, known_hosts, config, and the recommended permissions for each file.

The contents and permissions of the ~/.ssh folder on Linux

Nov 7, 2026 • 6 min read

How to Comment Out Multiple Lines in Vim

Comment out multiple lines in Vim with visual block mode, line ranges, or bundled gc mappings, then remove comments with the matching commands.

Vim editor commenting out a block of selected lines with the visual block insert technique

Nov 7, 2026 • 7 min read

Nginx 413 Request Entity Too Large: client_max_body_size Fix

Fix the Nginx 413 Request Entity Too Large error: raise client_max_body_size in the right context and match the PHP-FPM upload limits.

File upload stopped at a request size limit, with a 413 error and client_max_body_size setting

Nov 6, 2026 • 14 min read • series

ssh Command in Linux: Connect to Remote Servers

The ssh command connects you to a remote Linux server. This guide covers its syntax, the most useful options, key-based login, and port forwarding.

Using the ssh command to connect to a remote Linux server

Nov 6, 2026 • 7 min read

less Command in Linux: Navigate and Search Files

How to use the less command in Linux to view files page by page, search for text, follow log files in real time, and navigate with vi-style key bindings.

Nov 5, 2026 • 11 min read

Things to Do After Installing Ubuntu 26.04

Post-install checklist for Ubuntu 26.04: updates, drivers without Software & Updates, media codecs, Flatpak, backups, Ubuntu Pro, firewall, and desktop tweaks.