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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Jun 16, 2026 • 8 min read

How to Mount an NFS Share in Linux

Step-by-step instructions for mounting an NFS share in Linux: install the client, mount manually, persist with /etc/fstab, and troubleshoot common errors.

Apr 4, 2026 • 6 min read

Bash Functions

How to define and use Bash functions, pass arguments, return values, and apply best practices for writing cleaner and more maintainable scripts.

ln command in Linux for creating symbolic links

Apr 30, 2026 • 10 min read

ln Command in Linux: Create Symbolic Links

The ln command creates symbolic links on Linux, giving you a stable name that points to a moving target. This guide covers creating, updating, and cleaning up symlinks, plus the -sfn pattern used for atomic deploys.

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Jun 20, 2026 • 5 min read • series

/etc/passwd in Linux: File Format and Fields Explained

The cat /etc/passwd command displays local Linux accounts. This guide explains its seven fields and when to use getent passwd instead.

Padlock illustration labeled /etc/passwd

Jun 20, 2026 • 7 min read • series

Bash Exit Command and Exit Codes

The Bash exit command terminates a shell or script and returns an exit code. This guide covers exit status, the $? variable, exit code conventions, set -e, and practical script examples.

Jun 20, 2026 • 6 min read • new

TCP vs UDP: Differences and When to Use Each

Compare TCP vs UDP reliability, ordering, overhead, common ports, and use cases, with Linux ss commands for checking which transport a service uses.

Comparing the TCP and UDP transport protocols in Linux networking

Jun 20, 2026 • 7 min read

at Command in Linux: Schedule One-Time Tasks

The at command schedules one-time tasks to run at a specific time in Linux. This guide covers syntax, time formats, batch jobs, listing and removing jobs, and user restrictions.

Scheduling one-time tasks with the at command in Linux

Jun 19, 2026 • 5 min read

How to Add a Git Remote

Add a new remote to a Git repository with git remote add, then list, inspect, and push to it. Includes common errors and a git remote command reference.

Jun 19, 2026 • 9 min read • new

rsync Incremental Backups with --link-dest

Create space-efficient rsync incremental backups with --link-dest. Each dated snapshot remains directly browsable while unchanged files share disk space.

rsync incremental backup snapshots connected through hard links

Jun 18, 2026 • 7 min read • new

How to Install and Use Ollama on Ubuntu: Run LLMs Locally

Install Ollama on Ubuntu, run large language models locally, manage downloaded models, use GPU acceleration, and send prompts through the local API.

Install Ollama on Ubuntu to run large language models locally

Jun 17, 2026 • 5 min read

Configure Odoo with Nginx as a Reverse Proxy

Put Nginx in front of Odoo as an SSL termination and reverse proxy. This guide covers the full Nginx server block, WebSocket proxying for live chat, HTTP to HTTPS redirection, and locking down the Odoo backend.

Jun 17, 2026 • 6 min read • new • series

Bash Subshells: Isolate Variables and Directory Changes

Bash subshells run commands in an isolated shell environment. This guide explains parentheses, variable scope, directory changes, command substitution, pipelines, and exit codes.

Bash subshells shown as an isolated child shell inside a parent shell

Jun 16, 2026 • 8 min read

Odoo Backup: Automate Database and Filestore Backups

Set up automatic Odoo backups that include the PostgreSQL database and filestore. This guide covers validation, retention, cron scheduling, off-site copies, and restore testing.