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 4, 2026 • 10 min read • new

sqlite3 Command Line: Create and Query SQLite Databases

Create and query SQLite databases with sqlite3 on Linux. Import CSV files, format query results, and back up or restore your data.

SQLite database file labeled tasks.db with a SELECT query and a table of rows

Oct 4, 2026 • 11 min read

How to Check CPU Usage in Linux

This guide explains how to check CPU usage in Linux with top, htop, mpstat, vmstat, sar, ps, uptime, and per-core load tools.

Checking CPU usage in Linux with terminal monitoring tools

Oct 4, 2026 • 11 min read

modprobe Command in Linux: Load and Manage Kernel Modules

modprobe adds and removes Linux kernel modules along with their dependencies. See how to pass parameters, blacklist drivers, load modules at boot, and fix errors.

Gold hexagonal tiles with terminal and gear icons and the label modprobe command

Oct 3, 2026 • 11 min read

503 Service Unavailable Error: Causes and How to Fix It

The 503 Service Unavailable error means the server cannot handle your request right now. This guide explains what causes it on Nginx, Apache, and load balancers, and how to fix it.

Oct 3, 2026 • 9 min read • new

Fix npm Error: unable to get local issuer certificate

Resolve the npm UNABLE_TO_GET_ISSUER_CERT_LOCALLY error by trusting the right CA certificate instead of disabling TLS verification.

Certificate cards connected by a repaired link, illustrating npm certificate verification

Oct 3, 2026 • 5 min read

How to Rename a Directory or Folder in Linux

Rename a folder in Linux with mv, avoid the move-inside-existing-directory trap with -T, and batch rename directories using loops, find, and rename.

Rename Directories in Linux title on a yellow background

Oct 3, 2026 • 9 min read

git fetch vs git pull: What Is the Difference?

git fetch downloads remote changes without touching your branch, while git pull also merges or rebases them. See when to use each and how to fix pull errors.

Comparing git fetch and git pull commands in Git

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.