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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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.

May 1, 2026 • 4 min read

How to Show Line Numbers in Vim and Vi

Display line numbers in Vim or Vi for the current session, make them permanent in .vimrc, and switch between absolute, relative, and hybrid numbering.

ln command in Linux for creating symbolic links

Apr 30, 2026 • 10 min read

ln Command in Linux: Create Symbolic Links

The ln command creates symbolic links on Linux, giving you a stable name that points to a moving target. This guide covers creating, updating, and cleaning up symlinks, plus the -sfn pattern used for atomic deploys.

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

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Jul 17, 2026 • 8 min read • new

Email Authentication Explained: SPF, DKIM, and DMARC

SPF, DKIM, and DMARC help prevent domain spoofing. See how each check works, what DMARC alignment requires, and how to verify the DNS records with dig.

Email envelope passing SPF, DKIM, and DMARC authentication checks

Jul 17, 2026 • 4 min read

How to Unzip a .gz File in Linux

Unzip a .gz file in Linux with gzip or gunzip, keep the original file when needed, and extract .tar.gz archives with tar.

GZ file icon beside the text unzip .gz file on a yellow background

Jul 17, 2026 • 7 min read

Redirect HTTP to HTTPS in Nginx

How to redirect HTTP to HTTPS in Nginx using a separate server block with a 301 redirect, for a single site or all sites on the server.

Jul 16, 2026 • 8 min read

sha256sum and md5sum: Verify Checksums in Linux

Check a file's SHA-256 or MD5 checksum in Linux: generate digests with sha256sum and md5sum, verify SHA256SUMS lists with -c, and confirm ISO downloads.

Verifying file integrity with sha256sum and md5sum in Linux

Jul 16, 2026 • 4 min read • new

What Is stdin, stdout, and stderr in Linux

stdin, stdout, and stderr are Linux's three standard streams. See how file descriptors 0, 1, and 2 connect commands to terminals, files, and pipes.

Diagram of stdin entering a Linux process and stdout and stderr leaving it

Jul 15, 2026 • 10 min read • series

How to Set Environment Variables in Linux

Set, list, and make environment variables permanent in Linux. Covers shell vs environment variables, export, printenv, and persistent config in ~/.bashrc and /etc/profile.

Jul 15, 2026 • 6 min read • new

How to Configure Networking with Netplan on Ubuntu

Configure Ubuntu networking with Netplan using practical YAML examples for DHCP, static IP addresses, DNS, Wi-Fi, bridges, and safe remote changes.

Configuring network interfaces on Ubuntu with Netplan YAML files

Jul 14, 2026 • 7 min read

How to Enable and Disable Root User Account in Ubuntu

This guide explains how to enable and disable the root user account in Ubuntu using the passwd command, and covers safer alternatives like sudo -i and su -.

Jul 14, 2026 • 9 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 client IP forwarding, websockets, TLS termination, and common fixes.

Jul 14, 2026 • 5 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.