Practical Linux Tutorials and Command-Line Guides

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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.

Use SCP Command to Securely Transfer Files

Apr 24, 2026 • 7 min read

scp Command in Linux: Secure File Transfer Examples

SCP copies files securely between local and remote hosts over SSH. This guide covers syntax, common options, and practical examples for everyday file transfers.

GNU Screen terminal multiplexer managing multiple sessions in Linux

Apr 30, 2026 • 7 min read

How to Use Linux Screen

GNU Screen is a terminal multiplexer for managing persistent sessions over SSH. This guide covers sessions, windows, detach/reattach, scrollback mode, and customization.

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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.

Developer using the export command in a Linux terminal beside the Tux mascot

Jul 19, 2026 • 5 min read

How to Check Java Version

Find out which Java version is installed on your system, check the JDK compiler version, and manage multiple Java installations from the command line.

Jul 19, 2026 • 5 min read • new

What Is an Inode in Linux

An inode stores Linux file metadata, not its name or data. See how inode numbers and hard links work, then check inode usage with ls, stat, and df.

Filesystem layers showing a filename, inode metadata, and data blocks

Jul 18, 2026 • 8 min read

How to Install Docker on Ubuntu 24.04

Install the latest Docker Engine on Ubuntu 24.04 from Docker's official repository, verify the service, and configure non-root access.

Jul 18, 2026 • 8 min read

lsof Command in Linux: Find Open Files and What Is Using a Port

Use the lsof command to find what is using a port, identify processes holding files open, and locate deleted files that still consume disk space.

Using the lsof command to list open files and network connections in Linux

Jul 18, 2026 • 5 min read • new

How to Select All in Vim: Copy, Delete, or Yank Every Line

Select all text in Vim with ggVG, yank every line with :%y, copy the whole file to the system clipboard, or delete all lines with :%d. No plugins required.

Vim editor with every line selected after pressing g g V G

Jul 17, 2026 • 8 min read • new

Email Authentication Explained: SPF, DKIM, and DMARC

SPF, DKIM, and DMARC help prevent domain spoofing. See how each check works, what DMARC alignment requires, and how to verify the DNS records with dig.