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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Create Users in Linux Using the useradd Command

Mar 10, 2026 • 10 min read

How to Create Users in Linux (useradd Command)

Learn how to create and add users in Linux with the useradd command, including home directories, passwords, groups, shells, UIDs, and other common account options.

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 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.

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Jun 29, 2026 • 8 min read

How to Check Listening Ports in Linux: ss, netstat, lsof

Use ss, netstat, or lsof to list all listening ports in Linux, identify which process is using a specific port, and filter results by protocol or port number.

Jun 29, 2026 • 7 min read

How to Unzip Files in Linux

Extract ZIP archives in Linux with the unzip command: unzip to a folder, handle password-protected and multiple archives, list or test contents, and exclude files.

Jun 29, 2026 • 7 min read

How to Use Nano, the Linux Command Line Text Editor

Learn the essential nano commands and keyboard shortcuts: open, save, and exit files, search and replace text, copy and paste, and use sudo nano to edit system files.

Jun 29, 2026 • 6 min read • new

Fix SSH "Host Key Verification Failed" Error

Resolve the SSH Host key verification failed error by removing the stale known_hosts entry with ssh-keygen -R after verifying the server is genuine.

Fixing the SSH Host key verification failed error in known_hosts

Jun 28, 2026 • 6 min read • new

Hard Links vs Symbolic Links in Linux

Understand the difference between hard links and symbolic links in Linux: how inodes work, when each type breaks, and which one to use for a given task.

Comparing hard links and symbolic links in Linux with inodes

Jun 28, 2026 • 7 min read

date Command in Linux: Format, Timezone, and Epoch

Format dates, convert timezones, and work with Unix timestamps using the Linux date command, with copy-paste examples for the terminal and shell scripts.

Jun 27, 2026 • 8 min read

How to Mount and Unmount File Systems in Linux

Mount and unmount file systems in Linux with the mount and umount commands. Examples cover USB drives, ISO files, NFS shares, bind mounts, and persistent /etc/fstab entries.

Jun 27, 2026 • 4 min read

Check Linux Version: Find Your Distribution and Kernel Release

Check your Linux version from the terminal with /etc/os-release, hostnamectl, lsb_release, and uname. See when each command is useful.

Jun 27, 2026 • 5 min read

How to Mount an exFAT Drive on Ubuntu

Modern Ubuntu releases read and write exFAT drives out of the box. This guide shows how to mount exFAT USB drives and SD cards automatically or manually, install exfatprogs, set up an fstab entry, and fix common mount errors.

Jun 27, 2026 • 8 min read • new

How to Install NVIDIA CUDA Toolkit on Ubuntu 26.04

Install the NVIDIA CUDA Toolkit on Ubuntu 26.04 from the Ubuntu archive or NVIDIA repository, then verify the driver, nvcc compiler, and CUDA sample output.