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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Using the find command to search for files and directories in Linux

Jul 8, 2026 • 10 min read

find Command in Linux: Search Files and Directories

The find command searches for files and directories by name, type, size, date, permissions, and more. This guide covers practical examples including wildcards, exec actions, and combining find with grep.

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.

Bash case statement syntax and pattern matching examples

Jul 1, 2026 • 6 min read

Bash case Statement: Match Patterns in Shell Scripts

The Bash case statement matches a value against a list of patterns and runs the corresponding block. This guide explains argument parsing, syntax, glob patterns, multiple matches, and fall-through behavior.

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Jul 30, 2026 • 7 min read

cat Command in Linux: View, Combine, and Create Files

Display, combine, and create files with the cat command in Linux, plus line numbers, hidden characters, and when to use less instead.

Jul 30, 2026 • 10 min read

Python venv: How to Create and Use Virtual Environments

Python's venv module creates isolated environments so each project can pin its own package versions. This guide covers python -m venv, activating and deactivating, managing dependencies with requirements.txt, and when to reach for virtualenv, uv, or pipx instead.

Jul 30, 2026 • 7 min read • new

How to Install and Configure the AWS CLI on Linux

Install AWS CLI version 2 on Linux, authenticate with aws login or IAM Identity Center, manage profiles, and verify access to your AWS account.

AWS CLI installation and temporary credential setup in a Linux terminal

Jul 29, 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.

Jul 29, 2026 • 13 min read

How to Install Ubuntu 26.04

Step-by-step instructions for installing Ubuntu 26.04 from a bootable USB drive, covering ISO download, installer screens, disk setup, and first boot.

Jul 29, 2026 • 10 min read • new

How to Install Kubernetes with kubeadm on Ubuntu 26.04

Install Kubernetes 1.36 on Ubuntu 26.04 with kubeadm and containerd, configure Flannel networking, join worker nodes, and verify the cluster.

Kubernetes control plane and worker nodes installed with kubeadm on Ubuntu 26.04

Jul 28, 2026 • 7 min read

Understanding the /etc/shadow File in Linux

The /etc/shadow file stores hashed passwords and password aging data for each user on a Linux system. This guide explains the file format, hash types, field meanings, and how to query password information safely.

Jul 28, 2026 • 6 min read • series

Bash Positional Arguments: How to Use $1, $2, $@, and shift

Learn how Bash positional arguments work, including $0, $1, $#, "$@", "$*", shift, default values, and function arguments in scripts.

Jul 28, 2026 • 13 min read • series

How to Parse Command-Line Options in Bash with getopts

Parse short options in Bash scripts with getopts: option strings, OPTARG and OPTIND, silent error handling, long-option workarounds, and complete script examples.