Linux Fundamentals · 3.1
🌐 What Is Linux?
Open-source, flexible, and everywhere⏱ ~2 min
Linux is a family of operating systems built on the Linux kernel — the core piece of code that manages hardware. Unlike Windows, the kernel is open-source: anyone can read, modify, and distribute it. This led to hundreds of Linux 'distributions' (distros), each tailored for a different purpose.
Linux Distributions (Distros) to Know
| Distro | Package Manager | Target Use | CyberPatriot? |
|---|---|---|---|
| Ubuntu | apt | General purpose, most user-friendly | ✅ Main competition OS |
| Debian | apt | Stable, conservative — Ubuntu is based on Debian | Rarely |
| Fedora / Red Hat (RHEL) | dnf / yum | Enterprise and government | No |
| Kali Linux | apt | Security testing and forensics | Sometimes (advanced) |
| Linux Mint | apt | Beginner-friendly, Windows-like UI | No |
Linux vs. Windows — Key Differences
Linux
- •File paths use forward slashes: /home/user/file.txt
- •Case-sensitive: File.txt ≠ file.txt
- •Root account = superuser (like Administrator)
- •Many tasks require the command line (Terminal)
- •Software managed by package manager (apt)
- •Less malware targets Linux (but not immune)
- •Free and open-source
Windows
- •File paths use backslashes: C:\Users\user\file.txt
- •Case-insensitive by default
- •Administrator account = superuser
- •Most tasks done via GUI
- •Software installed via .exe/.msi installers
- •Far more malware targets Windows
- •Proprietary (paid license)
Linux Architecture
- •Hardware — physical CPU, RAM, disk, network card
- •Kernel — the core: manages hardware resources, memory, processes, and I/O
- •Shell — the interface between you and the kernel (bash is the most common shell)
- •Applications — programs that run in user space (Firefox, gedit, Python, etc.)
★ FactLinux powers over 90% of the world's web servers, 100% of the top 500 supercomputers, and all Android smartphones — it's not just for hobbyists.
🧠Quick Checkfirst try = +5 XP
What is the Linux equivalent of a Windows administrator?
🎮 Practice what you learned
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