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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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.

May 16, 2026 • 8 min read

How to Use wget in Linux with Examples

Step-by-step wget tutorial covering downloads, resuming, recursive mirroring, authentication, and the most useful options.

Using the find command to search for files and directories in Linux

Jul 8, 2026 • 10 min read

find Command in Linux: Search Files and Directories

The find command searches for files and directories by name, type, size, date, permissions, and more. This guide covers practical examples including wildcards, exec actions, and combining find with grep.

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Jul 13, 2026 • 2 min read

How to Change User Password in Ubuntu

Change a user password in Ubuntu from the command line with passwd, or through the GNOME Settings app. Covers your own account and other users.

Jul 13, 2026 • 7 min read

Docker: List Running and Stopped Containers

Use docker container ls and docker ps to list running and stopped containers, print names and IDs, filter results, and check Docker Compose projects.

Terminal output showing running Docker containers with docker container ls

Jul 13, 2026 • 6 min read • series

passwd Command in Linux: Change User Passwords

Change your own, another user's, or the root password in Linux with the passwd command. Covers password expiry with chage, forcing a change at next login, and account locking.

Jul 13, 2026 • 6 min read • new

tree Command in Linux: Display Directory Structure

The tree command lists directories recursively as an indented tree. This guide covers installation, depth limits, filtering, sizes, and saving the output.

Displaying a nested directory structure in a Linux terminal with the tree command

Jul 12, 2026 • 7 min read • series

How to Read a File Line By Line in Bash

Read a file line by line in Bash using a while loop and the read command. This guide covers IFS splitting, mapfile arrays, command output, and common pitfalls.

Jul 12, 2026 • 9 min read • new

How to Encrypt and Decrypt Files with GPG

Encrypt files with GPG using a passphrase or a key pair, share encrypted files with other people, protect whole directories, and decrypt safely in scripts.

Encrypting a file with the gpg command in a Linux terminal

Jul 12, 2026 • 11 min read

curl Command in Linux: Usage and Examples

The curl command transfers data to and from servers using HTTP, HTTPS, FTP, and other protocols. This guide covers downloads, headers, POST requests, verbose debugging, proxies, and API usage.

Using the curl command in Linux to transfer data and query APIs

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.