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Linux Beginner

What is SSH (Secure Shell)?

A cryptographic network protocol for secure remote login and command execution over an unsecured network.

SSH provides encrypted communication between two computers. It replaces insecure protocols like Telnet and rlogin. SSH uses public-key cryptography for authentication and symmetric encryption for data transfer.

Common uses include remote server management, file transfer (via SCP/SFTP), port forwarding, and tunneling. The default port is 22.

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A piece of code that can be loaded into the kernel at runtime to extend functionality without rebooting, such as device drivers and filesystems.
Xargs
A command that builds and executes commands from standard input, useful for processing lists of items.
Linux Bridge
A software-based network switch in the Linux kernel that connects multiple network interfaces at Layer 2, enabling VM and container networking.
Package Manager
A tool that automates the process of installing, updating, configuring, and removing software packages.
Top/Htop
Interactive process viewers that display real-time system resource usage including CPU, memory, and running processes.
SELinux
Security-Enhanced Linux — a mandatory access control system that confines programs to minimum required privileges beyond standard file permissions.
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