From DALL-E with some prompting
The image describes the Linux Run Levels, which are modes of operation in Unix-like operating systems. It explains the directories /etc/rcX.d where X is the run level number, and /etc/init.d which contains the original script files. The various levels are highlighted:
- Level 0: Halt the system.
- Level 1: Single user mode.
- Level 2: Single user mode without networking.
- Level 3: Single user mode with networking.
- Level 4: Unused.
- Level 5: Multi-user mode with networking and GUI.
- Level 6: Reboot.
Scripts starting with S are used to start services, and those starting with K are used to stop services. The scripts are symbolically linked and have a naming convention that usually starts with S or K followed by a number indicating the order of execution.
Lechuck Park 