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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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 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.

Using the rsync command to sync files and directories in Linux

Feb 23, 2026 • 7 min read

Rsync Command in Linux with Examples

Learn how to use the rsync command to sync files and directories locally and remotely. Covers common options, remote transfers, dry run, exclusions, and troubleshooting.

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Sep 5, 2026 • 7 min read • new

btop Command in Linux: Monitor System Resources

Monitor CPU, memory, disks, network traffic, and processes with btop. This guide covers installation, keyboard shortcuts, process actions, and configuration.

btop terminal dashboard with CPU, memory, disk, network, and process monitoring panels

Sep 5, 2026 • 8 min read • series

Bash source Command: Load Scripts and Variables

Use source (or its dot shorthand) to run a file in your current shell, reload .bashrc, share functions between scripts, and load variables from a config file.

Using the Bash source command to load scripts and variables

Sep 5, 2026 • 8 min read

Listing Linux Services with systemctl

Use the systemctl command to list running, failed, and enabled Linux services. Includes filtering by state, checking status, and listing unit files.

Terminal output of systemctl list-units showing loaded Linux services

Sep 3, 2026 • 13 min read

Crontab: Scheduling Cron Jobs in Linux

Cron is a Linux scheduling daemon that runs tasks at defined intervals. This guide explains crontab syntax, operators, predefined macros, environment variables, and practical scheduling examples.

Crontab cron job scheduling syntax and examples in Linux

Sep 3, 2026 • 11 min read

CPU Info on Linux: Check CPU Details from the Command Line

Read CPU model, core and thread counts, cache sizes, and virtualization support on Linux from the command line with /proc/cpuinfo, lscpu, and dmidecode.

Checking CPU information on Linux using lscpu and /proc/cpuinfo

Sep 3, 2026 • 11 min read

ps Command in Linux: ps aux and Common Options

Use ps aux and related ps command options in Linux to list running processes, read output columns, sort by CPU or memory, filter by PID or user, and show full command lines.

Using the ps aux command to list Linux processes

Sep 2, 2026 • 11 min read

Check Open Ports in Linux: nmap, netcat, and Bash

Scan a Linux host or remote server for open ports with nmap, netcat, telnet, and Bash /dev/tcp, then distinguish closed ports from filtered connections.

Checking open ports on a Linux system from the command line

Sep 2, 2026 • 12 min read

ss Command in Linux: Display Socket Statistics

Use the ss command to list TCP, UDP, and Unix sockets, filter by port and state, read queue columns, inspect timers, and replace common netstat commands.

Using the ss command to display socket statistics in Linux

Sep 2, 2026 • 9 min read • new

How to Open a Port in the Firewall on Linux

Open a port in a Linux firewall with ufw, firewalld, nftables, or iptables, then make the rule persistent and test remote access.

Linux firewall allowing TCP traffic through port 80

Sep 1, 2026 • 10 min read

PHP Error Reporting: Enable, Display, and Log Errors

Step-by-step instructions for configuring PHP error reporting. Covers error levels, display_errors, error_log, php.ini settings, and runtime configuration with error_reporting().