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 1, 2026 • 4 min read

How to Show Line Numbers in Vim and Vi

Display line numbers in Vim or Vi for the current session, make them permanent in .vimrc, and switch between absolute, relative, and hybrid numbering.

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.

Apr 24, 2026 • 5 min read

gzip Command in Linux

Step-by-step examples for compressing and decompressing files with the gzip command in Linux, covering the most useful options.

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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.

Automated Odoo database and filestore backup workflow

Jun 16, 2026 • 7 min read • new • series

The ~/.ssh Folder: Files, Permissions, and Layout

What lives inside ~/.ssh on Linux: private keys, authorized_keys, known_hosts, config, and the recommended permissions for each file.

The contents and permissions of the ~/.ssh folder on Linux

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.

Jun 15, 2026 • 10 min read

Python Tuples: Create, Access, Slice, and Unpack

Work with Python tuples: how to create, access, slice, unpack, and loop over them, plus how tuples differ from lists and when to use each.

Jun 15, 2026 • 5 min read

How to Undo Last Git Commit

Undo the last Git commit with git reset or git revert, and pick the right option to keep your changes, discard them, or safely undo a pushed commit.

Jun 15, 2026 • 5 min read • new

hostnamectl Command in Linux: Set and Query Hostname

Use hostnamectl to view and change the Linux hostname. Covers static, transient, and pretty names, system metadata, remote hosts, and common errors.

hostnamectl changing a Linux system name from old-host to web-server-01

Jun 14, 2026 • 6 min read

How to Setup a Git Server

Run your own private Git server over SSH on Linux. This guide covers installing Git, creating the git user, adding SSH keys, and pushing your first repository.