Linux Fundamentals

In Linux, everything from text documents to hardware devices (like hard drives or printers) is treated as a file. This unified approach makes configuring hardware as easy as editing text.

Security is baked in. Every file has read (r), write (w), and execute (x) permissions assigned to the Owner, the Group, and Everyone else. Managed via `chmod` and `chown`.

The Kernel is the core that talks directly to the hardware. The Shell (like Bash) is the user interface that takes your commands and translates them for the Kernel to execute.

Instead of downloading installers from websites, Linux uses package managers (like APT in Ubuntu) to securely download, install, and update software from trusted centralized repositories.

Daemons are background services (like your Apache web server). Systemd is the modern init system that manages these daemons, handling their startup, logging, and restarting if they crash.

The true power of the CLI. You can take the output of one command and "pipe" it (|) directly as the input to another, chaining small tools together to perform highly complex engineering tasks.