Linux · Module 02

Linux System Administration and Networking

Manage identities, packages, processes, services, networking, and scheduled jobs on Linux.

Practice interactively →

What you will learn

• Manage users and secondary groups safely
• Install packages with the correct distro tools
• Control processes and systemd services
• Diagnose networks, ports, and cron schedules

Lessons

1. Manage users and groups

   Create identities and memberships without overwriting existing access.

2. Package management with apt, dnf, and yum

   Distinguish metadata refresh, upgrades, and package installation.

3. Processes and system information

   Observe a process and choose the least disruptive suitable signal.

4. Services with systemd

   Distinguish current runtime state from boot-time configuration.

5. Networking basics and ports

   Separate reachability, name resolution, and listening-socket checks.

6. Schedule work with crontab

   Read the five cron fields and write jobs that work in a minimal environment.