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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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.

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

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.

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.

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Aug 26, 2026 • 11 min read

How to Add APT Repository in Ubuntu

Add APT repositories in Ubuntu using add-apt-repository, the signed-by method, and PPA. Includes the DEB822 format used by default on Ubuntu 24.04 and 26.04.

Adding an APT repository on Ubuntu using add-apt-repository

Aug 25, 2026 • 8 min read

How to Change a Git Commit Message, Even After Pushing

Change the last Git commit message with git commit --amend, reword older commits with an interactive rebase, and update commits you already pushed.

Changing a Git commit message with git commit --amend

Aug 24, 2026 • 11 min read • new

parted Command in Linux: Manage Disk Partitions

Use the parted command to inspect disks, create GPT partition tables, add aligned partitions, resize boundaries, and remove partitions safely on Linux.

Managing disk partitions with the parted command in Linux

Aug 24, 2026 • 5 min read

How to Rename a Git Branch: Local and Remote

This guide shows how to rename a Git branch locally and on the remote using git branch -m, then push the new name and delete the old remote branch.

Renaming a local and remote Git branch with git branch -m

Aug 23, 2026 • 18 min read

dig Command in Linux: DNS Lookup

The dig command is a DNS lookup tool for querying name servers. This guide covers querying record types, reverse lookups, tracing resolution paths, and verifying DNSSEC.

Dig command querying DNS records in a Linux terminal

Aug 23, 2026 • 8 min read • series

Bash Append to File: >>, tee, and Heredoc Examples

Append text to a file in Bash without erasing existing content. Covers >>, echo, printf, tee -a for protected files, and combining files.

Appending text to a file in Bash using the >> redirection operator

Aug 23, 2026 • 14 min read

500 Internal Server Error: What It Means & How to Fix It

A 500 Internal Server Error means the server encountered an unexpected condition. This guide explains common causes, how to diagnose the problem using log files, and steps to fix it.

Aug 22, 2026 • 6 min read

How to Change the Hostname in Linux

Change the hostname in Linux with hostnamectl and /etc/hosts. Covers permanent, temporary, cloud-init, and non-systemd methods.

Three illustrated server towers beside the text Change Hostname in Linux

Aug 22, 2026 • 7 min read

curl POST Request Examples

Send data with curl -d, --json, and -F: POST examples for HTML forms, JSON APIs, file uploads, and reading the body from a file or stdin.

Aug 22, 2026 • 12 min read • series

Sudo Command in Linux: Run Commands as Root

The sudo command runs programs as root or another user. This guide covers sudoers setup, root shells, sudoedit, credential caching, and common sudo options.