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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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.

Extracting tar.gz files in Linux with the tar command

Jul 6, 2026 • 8 min read

How to Extract (Unzip) tar.gz Files in Linux

Extract tar.gz and tgz archives with the tar command. Covers extracting to a directory, pulling specific files, wildcards, stdin piping, and listing archive contents.

Aug 5, 2026 • 9 min read

How to Install Python on Ubuntu 24.04

Install Python on Ubuntu 24.04 using the default Ubuntu packages, the deadsnakes PPA for newer versions, or a source build. Includes pip and virtual environments.

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Aug 6, 2026 • 16 min read • series

chmod Command in Linux: Change File and Directory Permissions

The chmod command changes file and directory permissions in Linux. This guide covers what chmod 755, 644, 700, and 600 mean, how to use symbolic and numeric modes, and how to apply permissions recursively.

Aug 6, 2026 • 13 min read • series

sftp Command in Linux: Transfer Files Securely

The sftp command transfers files securely over SSH. Connect to servers, upload and download files, resume transfers, and automate batch jobs.

Aug 6, 2026 • 7 min read • series

How to Check if a File or Directory Exists in Bash

This guide explains how to check if a file or directory exists in Bash using test and if statements, with clear examples for common file checks.

Bash test operators checking a file and directory

Aug 5, 2026 • 11 min read

mv Command in Linux: Move Files and Directories

Move and rename files and directories in Linux with the mv command, including overwrite prompts, backups, the -T option, and cross-filesystem moves.

Move Files and Directories in Linux - mv Command

Aug 5, 2026 • 7 min read

How to Save a File and Exit Vim / Vi

Save a file and quit Vim or Vi with :w, :wq, :q!, :x, ZZ, and ZQ. This guide explains the common save, exit, discard, and read-only file commands.

Aug 5, 2026 • 9 min read

How to Install Python on Ubuntu 24.04

Install Python on Ubuntu 24.04 using the default Ubuntu packages, the deadsnakes PPA for newer versions, or a source build. Includes pip and virtual environments.

Aug 5, 2026 • 9 min read

cd Command in Linux: Change Directories

Change directories in Linux with cd, covering absolute and relative paths, home and parent shortcuts, symbolic links, CDPATH, and common errors.

Aug 4, 2026 • 6 min read

Install deb Files on Ubuntu: apt, dpkg, and gdebi

Install local .deb files on Ubuntu with apt, dpkg, or gdebi. Fix dependency errors, inspect packages, install via GUI, and remove them safely.

Aug 4, 2026 • 7 min read

Linux Folder Size: How to Check File and Directory Sizes

Check folder and file sizes in Linux with du. Compare directory totals, rank subdirectories, exclude paths, and check free space with df.

Aug 4, 2026 • 8 min read • new

Regular Expressions Explained: How Regex Patterns Work

Regular expressions explained from the ground up: how anchors, character classes, quantifiers, and groups build patterns that work in grep, sed, and awk.