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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May 4, 2026 • 6 min read

How to Check File and Directory Size in Linux

Check file and directory sizes in Linux with du. This guide covers readable totals, subdirectory sizes, sorting by size, exclusions, and file size checks.

Mar 11, 2026 • 9 min read

chown Command in Linux: Change File Ownership

Use the chown command in Linux to change file and directory ownership, including recursive changes, symbolic links, and practical ownership examples.

Use SCP Command to Securely Transfer Files

Apr 24, 2026 • 7 min read

scp Command in Linux: Secure File Transfer Examples

SCP copies files securely between local and remote hosts over SSH. This guide covers syntax, common options, and practical examples for everyday file transfers.

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Jul 11, 2026 • 8 min read

nohup Command in Linux: Background Jobs and Output

nohup keeps commands running after logout. The 'appending output to nohup.out' message is not an error. This guide covers background jobs, 2>&1 redirection, and stopping processes.

Using the nohup command in Linux to run commands after logout

Jul 11, 2026 • 8 min read

tmux Command in Linux: Sessions, Windows, and Panes

The tmux command lets you run persistent terminal sessions with multiple windows and panes. This guide covers creating and managing sessions, splitting panes, copy mode, and configuration.

Using tmux to manage terminal sessions, windows, and panes in Linux

Jul 11, 2026 • 5 min read • new

strace Command in Linux: Trace System Calls

Use the strace command to trace system calls and signals on Linux, debug why a program fails, find missing files, and measure where a process spends its time.

Tracing system calls with the strace command in Linux

Jul 10, 2026 • 10 min read

Debian vs Ubuntu Server: Which One Should You Use?

Side-by-side comparison of Debian and Ubuntu Server covering release cycles, package freshness, security, cloud support, and ease of setup to help you pick the right one.

Jul 10, 2026 • 6 min read

apt vs apt-get: The Difference and When to Use Each

apt and apt-get are not the same tool: apt is built for interactive terminal use, apt-get for scripts and automation. Compare their commands and see when to use each.

Jul 10, 2026 • 7 min read • new

How to Manage Node.js Processes with PM2

How to install PM2, run and manage Node.js processes with clustering, zero-downtime reloads, log rotation, and systemd integration that survives reboots.

Jul 9, 2026 • 4 min read

How to Check Your Ubuntu Version

Check which Ubuntu version you are running with lsb_release, /etc/os-release, or hostnamectl, plus a current release list up to Ubuntu 26.04 LTS.

Terminal commands used to check the Ubuntu version

Jul 9, 2026 • 7 min read • new • series

Bash Parameter Expansion: Defaults, Substrings, and Replacement

Bash parameter expansion handles default values, substrings, string length, pattern trimming, search and replace, and case conversion, all inside the shell.

Bash parameter expansion syntax examples in a Linux terminal

Jul 8, 2026 • 11 min read

htop Command in Linux: How to Monitor and Manage Processes

Monitor Linux processes in real time with htop: read CPU and memory meters, sort and filter the process list, and kill or renice processes from one screen.

Using the htop command to monitor processes interactively in Linux

Jul 8, 2026 • 4 min read • series

How to Concatenate Strings in Bash

Concatenate strings in Bash by placing variables side by side, appending with the += operator, or formatting with printf -v. Includes examples for variables, literals, and command output.