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.

Installing the Claude Code AI coding assistant in a Linux terminal on Ubuntu

Jul 6, 2026 • 6 min read

How to Install Claude Code on Ubuntu and Linux

Install Claude Code on Ubuntu, Debian, and other Linux distributions using the recommended native installer, official package-manager repositories, or npm.

ln command in Linux for creating symbolic links

Jul 31, 2026 • 11 min read

How to Create Symlinks in Linux with ln

The ln command creates symbolic links on Linux, giving you a stable name that points to a moving target. This guide covers creating, updating, and cleaning up symlinks, plus the -sfn pattern used for atomic deploys.

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Sep 30, 2026 • 9 min read • new

How to Diagnose OOM Killer Events in Linux

Diagnose Linux OOM kills with dmesg and journalctl, identify affected processes, check service memory limits, and investigate systemd-oomd events.

Rising memory usage bars above a Linux log with a highlighted Killed process entry

Sep 30, 2026 • 7 min read

What Is /dev/null in Linux

The Linux /dev/null device discards anything written to it and returns EOF when read. This guide shows how to silence stdout, stderr, cron output, and empty files.

Discarding command output by redirecting it to /dev/null in Linux

Sep 30, 2026 • 11 min read

.gitignore: Ignore Files and Folders in Git

Use .gitignore to ignore folders, files, logs, and build output in Git. Covers the pattern syntax, global rules, tracked-file cleanup, and debugging commands.

Sep 30, 2026 • 8 min read

How to Change MySQL User Password

Change a MySQL or MariaDB user password from the mysql shell using ALTER USER. Covers MySQL 8.0 and 8.4, the root account on Ubuntu, FLUSH PRIVILEGES, and common errors.

Sep 29, 2026 • 10 min read

Using curl to Make REST API Requests

Send GET, POST, PUT, PATCH, and DELETE requests to a REST API with curl, pass tokens and API keys, and check status codes and JSON responses from the terminal.

Sep 29, 2026 • 13 min read

How to Use the Linux ftp Command to Transfer Files

Transfer files to and from a remote server using the Linux ftp command. Covers connections, downloads, uploads, passive mode, and scripted transfers.

Terminal session showing an FTP file transfer in progress

Sep 28, 2026 • 14 min read • series

fdisk Command in Linux: Create Disk Partitions

Use the fdisk command in Linux to list disks, create GPT or MBR partitions, change partition types, format new partitions, and mount them safely.

Terminal showing fdisk partition table output

Sep 28, 2026 • 12 min read

timedatectl Command in Linux: Manage Time, Date, and Time Zone

Check and change the system time, time zone, and NTP sync with timedatectl, plus how to see and set NTP servers with chrony or systemd-timesyncd.

timedatectl command output showing system time and time zone in a Linux terminal

Sep 28, 2026 • 10 min read

How to Edit Your Hosts File on Linux, Windows, and macOS

Edit the hosts file on Linux, Windows, and macOS to override DNS locally. Includes file paths, entry examples, saving steps, and verification commands.

Sep 27, 2026 • 12 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.