Practical Linux Tutorials and Command-Line Guides

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

Featured Articles

Mar 11, 2026 • 8 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.

Aug 4, 2026 • 7 min read

Linux Folder Size: How to Check File and Directory Sizes

Check folder and file sizes in Linux with du. Compare directory totals, rank subdirectories, exclude paths, and check free space with df.

Apr 19, 2026 • 6 min read

Bash Heredoc: Complete Guide with Examples

Bash heredoc lets you pass multi-line text directly to a command inside a shell script. This guide covers syntax, variable expansion, indentation with <<-, SSH usage, and common mistakes.

Linuxize Weekly Newsletter

A quick weekly roundup of new tutorials, news, and tips.

Latest Articles

View all articles

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().

Configuring PHP error reporting to display and log errors

Sep 1, 2026 • 12 min read

dnf Command in Linux: Install, Update, and Manage Packages

Common dnf commands for installing, updating, removing, searching, and managing packages on Fedora, RHEL, Rocky Linux, AlmaLinux, and other RPM-based systems.

dnf command package management reference

Sep 1, 2026 • 9 min read

How to List Installed Packages on Debian with apt and dpkg

See what is installed on Debian, which packages you chose yourself, which use the most disk space, and when each one arrived, using apt and dpkg-query.

List Installed Packages with apt and dpkg on Debian

Aug 31, 2026 • 10 min read • new

What Is .bashrc? When It Runs and What to Put in It

~/.bashrc controls aliases, functions, prompts, and other interactive Bash settings. See when it runs, what belongs inside it, and how to reload changes.