🐧 Linux Tutorials

Free Linux tutorials and step-by-step guides for developers.

Analyse Disk Usage on Linux with df, du, and ncdu

Find out what is consuming your disk space — from a quick filesystem overview down to the exact directory or file responsible.

Find and Kill a Process Using a Port on Linux

Stop getting "address already in use" errors. Find what is holding a port and remove it in seconds.

Harden a Fresh Linux Server: First 10 Steps

The actions that matter most in the first hour after provisioning a new server — before it gets hammered by bots and before something goes wrong.

How to Set Cron Schedules on Linux

A step-by-step guide to scheduling automated tasks with cron on any Linux system.

Linux File Permissions Explained: chmod, chown, and umask

Read the permission string on any file, change who owns it, and understand what umask does to files you create.

Mount an NFS Share Permanently with fstab

Connect a remote NFS export to your Linux machine, verify it works, then add it to /etc/fstab so it survives reboots without hanging the system.

Replace a Cron Job with a systemd Timer

Why and how to migrate a cron entry to a systemd timer for better logging, dependency handling, and missed-run recovery.

Set Up SSH Key Authentication and Disable Passwords

Generate a modern SSH key pair, install it on a remote host, and lock password login out entirely.

tmux: Persistent Terminal Sessions for Developers

Keep processes running after you disconnect, split your terminal into panes, and switch between projects without opening a new window.