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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Sep 21, 2026 • 4 min read

Create a Linux Swap File

How to create and enable a swap file on Linux, configure swappiness, resize an existing swap file, and remove it when no longer needed.

Sep 26, 2026 • 10 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.

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.

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Oct 1, 2026 • 13 min read

nmap Command in Linux with Practical Examples

Practical nmap examples for Linux: find live hosts, scan specific or top ports, run sudo nmap SYN scans, detect service versions, and speed up scans with -T4.

Oct 1, 2026 • 13 min read

Configuring the Apache Error and Access Logs

How to configure and read Apache access and error logs, including log formats, virtual host logging, log file locations, and filtering log output.

Oct 1, 2026 • 8 min read

Linux patch Command: Apply Diff Files

The Linux patch command applies diff files to your original files. Examples cover creating a patch with diff, testing it with --dry-run, -p1 for Git patches, backups, and reversing changes.

Using the Linux patch command to apply diff patch files

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.