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 24, 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.

Mar 11, 2026 • 8 min read

Using the SSH Config File

Set up the SSH client config file to manage multiple remote connections with custom hostnames, users, ports, keys, and jump hosts — all without long command-line flags.

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.

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Jul 22, 2026 • 4 min read • new

Dockerfile COPY vs ADD: Which to Use

Compare Dockerfile COPY and ADD for local files, build stages, remote URLs, Git repositories, and tar extraction, with clear guidance on when to use each.

Split comparison of Dockerfile COPY and ADD instructions moving source files into an image layer

Jul 22, 2026 • 5 min read

Linux uname Command: Print System Information

The uname command prints kernel name, version, architecture, and hostname. This guide covers all uname options with examples and practical scripting uses.

Using the uname command to print system information in Linux

Jul 21, 2026 • 8 min read

which Command in Linux: Find Executable Locations

Use the which command to locate executables in PATH, list every match, and check command availability. Compare which with command -v, type, and whereis.

Using the which command in Linux to find executable locations

Jul 21, 2026 • 6 min read

How to Set or Change the Time Zone in Linux

Check and change the Linux system time zone with timedatectl, choose the correct Region/City value, verify /etc/localtime, and handle non-systemd systems.

Globe illustration representing Linux time zone settings

Jul 21, 2026 • 5 min read

head Command in Linux: Print the First N Lines of a File

The head command prints the first lines or bytes of a file. This guide shows how to display a specific number of lines, preview files, and limit command output in pipelines.

Using the head command in Linux to display the first lines of a file

Jul 21, 2026 • 7 min read • new

lsusb, lspci, and lshw: List Hardware in Linux

Identify the hardware in a Linux machine: list USB devices with lsusb, find PCI cards and their drivers with lspci, and get a full inventory with lshw.

Listing PCI and USB hardware devices in a Linux terminal

Jul 20, 2026 • 6 min read • new

How to Comment Out Multiple Lines in Vim

Comment out multiple lines in Vim with visual block mode, line ranges, or bundled gc mappings, then remove comments with the matching commands.

Vim editor commenting out a block of selected lines with the visual block insert technique

Jul 20, 2026 • 6 min read

tail Command in Linux: Show Last Lines and Follow Logs

Use the Linux tail command to show the last N lines or bytes of a file, follow logs in real time with tail -f, and filter live output with grep.

Terminal window showing the tail command following a Linux log file in real time

Jul 19, 2026 • 9 min read • series

umask Command in Linux: Set Default File Permissions

The umask command sets the default permission mask for newly created files and directories. This guide explains how umask works, how to calculate its value, and how to make it permanent.

Setting default file permissions with the Linux umask command

Jul 19, 2026 • 5 min read • series

export Command in Linux: Set Bash Environment Variables

Use export to turn Bash shell variables into environment variables that child processes inherit, list exported variables, and make them permanent across sessions.