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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May 5, 2026 • 7 min read

How to Install Docker on Debian 13 (Trixie)

Install Docker on Debian 13 from the official Docker repo. Set up the apt keyring, install Engine and Compose plugin, and fix common errors.

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.

Jul 27, 2026 • 7 min read

How to Upgrade to Ubuntu 26.04

Upgrade Ubuntu 25.10 or 24.04 LTS to Ubuntu 26.04 Resolute Raccoon, including the early command-line path before the 26.04.1 point release.

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Aug 14, 2026 • 7 min read • series

Bash Shebang: What #!/bin/bash Means in Shell Scripts

A Bash shebang tells Linux which interpreter runs a script. See what #!/bin/bash means, how /usr/bin/env bash differs, and what happens without #!.

Aug 14, 2026 • 9 min read

last Command in Linux: Check Login History

Use the last command in Linux to check login history, filter sessions by user or date, and audit access. Covers lastb, lastlog, and the wtmpdb replacement.

Illustration of a user checking the last command in Linux

Aug 14, 2026 • 11 min read

How to Use wget in Linux with Examples

Practical wget examples for downloading files, resuming transfers, limiting bandwidth, mirroring websites, and handling authentication on Linux.

Aug 14, 2026 • 11 min read • series

How to List Users in Linux

List all users in Linux with getent passwd, lslogins, or /etc/passwd. Filter human users by UID, check group membership, and see who is logged in.

Aug 13, 2026 • 13 min read • series

history Command in Linux: View and Manage Bash History

Use the history command in Linux to view, search, and clean up Bash command history. Covers expansions, HISTSIZE, HISTIGNORE, and security tips.

Aug 13, 2026 • 8 min read • new

lsblk Command in Linux: List Block Devices

Use lsblk to list disks, partitions, filesystems, UUIDs, and mount points in Linux, then customize columns and produce JSON output for scripts.

Using the lsblk command to list block devices and partitions in Linux

Aug 13, 2026 • 8 min read

How to Undo and Redo in Vim / Vi

Undo and redo in Vim or Vi with u, Ctrl+r, :earlier, and :later. Covers time-based undo, undo branches, and persistent undo with undofile.

Aug 13, 2026 • 10 min read • series

How to Remove a User in Linux

Remove a user in Linux with userdel, including the home directory, active sessions, scheduled jobs, SELinux mappings, and files left behind.

Aug 11, 2026 • 7 min read

How to Install Node.js and npm on Ubuntu 26.04

Install Node.js 24 LTS or the current Node.js 26 release on Ubuntu 26.04 using NodeSource, nvm, or the default Ubuntu packages.

Aug 11, 2026 • 9 min read • series

su Command in Linux: How to Switch Users

Use the su command to switch users, open a root login shell, and run commands as another account. Includes options, sudo su, troubleshooting, and examples.