Practical Linux Tutorials and Command-Line Guides

Search hundreds of step-by-step tutorials for Bash, Ubuntu, networking, security, and more.

Featured Articles

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.

GZ file icon beside the text unzip .gz file on a yellow background

Jul 17, 2026 • 4 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.

Mar 17, 2026 • 8 min read

Bash printf Command

A practical guide to printf in Bash: formatting numbers, strings, and alignment.

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Nov 5, 2026 • 11 min read

Things to Do After Installing Ubuntu 26.04

Post-install checklist for Ubuntu 26.04: updates, drivers without Software & Updates, media codecs, Flatpak, backups, Ubuntu Pro, firewall, and desktop tweaks.

Nov 5, 2026 • 9 min read

How to Find Which Process Is Using a Port in Linux

Find the Linux process listening on a TCP or UDP port with ss, lsof, fuser, or netstat, then inspect and stop it safely.

Finding the process that is listening on a network port in Linux

Nov 5, 2026 • 8 min read • new

Fix pip "externally-managed-environment" Error on Ubuntu and Debian

Fix pip's externally-managed-environment error on Ubuntu and Debian with a virtual environment, pipx, or apt, without changing the system Python packages.

A protected system Python environment beside a separate project environment holding a Python package

Nov 5, 2026 • 9 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.

Nov 4, 2026 • 9 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.

Nov 4, 2026 • 7 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.

Nov 4, 2026 • 10 min read

zip Command in Linux: Zip Files and Directories

Create ZIP archives in Linux with the zip command. Zip directories recursively, exclude files, add a password, and split large archives.

Nov 4, 2026 • 11 min read • new

jq Command: Process JSON from the Terminal

How to use the jq command to read, filter, and transform JSON on the command line, from selecting fields to building new objects and parsing API responses.

Filtering and transforming JSON on the command line with the jq command

Nov 3, 2026 • 8 min read • series

passwd Command in Linux: Change User Passwords

Change your own, another user's, or the root password in Linux with the passwd command. Covers password expiry with chage, forcing a change at next login, and account locking.