Practical Linux Tutorials and Command-Line Guides

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

Featured Articles

Apr 22, 2026 • 6 min read

Ping Command in Linux

The ping command tests network connectivity by sending ICMP packets to a host and reporting latency, TTL, and packet loss.

Jul 27, 2026 • 6 min read

How to Install Docker on Ubuntu 26.04

Install Docker on Ubuntu 26.04 from the official Docker repository. Covers repository setup, verification, running without sudo, updates, and uninstall steps.

Jul 27, 2026 • 6 min read

How to Install PHP on Ubuntu 26.04

Learn how to install PHP 8.5 on Ubuntu 26.04 with Apache or Nginx. Includes PHP-FPM setup, common extensions, and installing other PHP versions.

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A quick weekly roundup of new tutorials, news, and tips.

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Oct 19, 2026 • 7 min read • new

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.

Green Nginx emblem above the text Nginx 413 Error and client_max_body_size

Oct 19, 2026 • 11 min read • series

usermod Command in Linux: Modify User Accounts and Groups

Modify Linux user accounts with usermod: add users to groups with -aG, change the shell or home directory, rename users, set passwords, and lock accounts.

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.

Oct 18, 2026 • 8 min read • new • series

SSH Broken Pipe Error: Causes and Fixes

Fix "client_loop: send disconnect: Broken pipe" with SSH keepalives, find what closed the connection, and keep long jobs running in tmux.

Terminal surrounded by an interrupted SSH connection loop and keepalive pulses

Oct 18, 2026 • 13 min read

Nginx Location Blocks: Match Rules and Priority

How Nginx picks a location block: prefix, exact, and regex matches, the priority order, named locations, and common configuration patterns.

Oct 18, 2026 • 7 min read

How to Truncate Files in Linux: Empty Files Without Deleting

Empty a file without deleting it using shell redirection or the truncate command. Covers permissions, sudo workarounds, and truncating log files.

Terminal showing a file being truncated to zero bytes in Linux

Oct 17, 2026 • 14 min read

Nginx Reverse Proxy: How to Configure proxy_pass and Headers

Configure Nginx as a reverse proxy with proxy_pass and proxy_set_header, including trailing slash rules, load balancing, websockets, TLS, and common errors.

Oct 17, 2026 • 11 min read • series

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.

Oct 16, 2026 • 8 min read • new

SSH Multiplexing: Speed Up SSH with ControlMaster

Configure SSH multiplexing with ControlMaster, ControlPath, and ControlPersist to reuse connections for SSH sessions and file transfers.

Three SSH terminal sessions sharing one encrypted connection to a server

Oct 16, 2026 • 10 min read • series

Bash Heredoc: Complete Guide with Examples

Bash heredoc lets you pass multi-line text directly to a command inside a shell script. This guide covers syntax, variable expansion, indentation with <<-, SSH usage, and common mistakes.