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 26, 2026 • 2 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.

Apr 30, 2026 • 8 min read

Things to Do After Installing Ubuntu 26.04

A practical checklist for setting up Ubuntu 26.04 after installation, including updates, drivers, codecs, Flatpak, backups, firewall settings, and desktop tweaks.

Use SCP Command to Securely Transfer Files

Apr 24, 2026 • 7 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, common options, and practical examples for everyday file transfers.

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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.

Jul 13, 2026 • 2 min read

How to Change User Password in Ubuntu

Change a user password in Ubuntu from the command line with passwd, or through the GNOME Settings app. Covers your own account and other users.

Jul 13, 2026 • 7 min read

Docker: List Running and Stopped Containers

Use docker container ls and docker ps to list running and stopped containers, print names and IDs, filter results, and check Docker Compose projects.

Terminal output showing running Docker containers with docker container ls

Jul 13, 2026 • 6 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.