Linux in one liners
Linux basic terminology: all you need to get started
Software Engineer
1. Linux → the kernel, not the full operating system. It talks to hardware.
2. Kernel → controls CPU, memory, disk, network. The brain of the system.
3. Operating System → kernel + tools + libraries + apps.
4. Distribution (Distro) → Linux kernel bundled with tools. Example: Ubuntu, CentOS.
5. GNU Tools → basic commands like ls, cp, grep. This is why people say GNU/Linux.
6. Terminal → where you type commands.
7. Shell → program that reads your commands. Bash is common.
8. File System → everything starts from /. No drive letters.
9. Root User → admin user with full control.
10. Permissions → decide who can read, write, or run files.
11. Process → a running program.
12. Service → program running in background.
13. Package Manager → installs software. apt, yum, dnf.
14. SSH → connect to another machine securely.
15. Logs → files that record system activity and errors.
