System V

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Internal

Overview

System V (or SysV) is an init system, used to manage services on a Linux system. It servers the same purpose as systemd.

Differences between System V and systemd

Differences between System V and systemd

init

Runlevels

System V uses runlevels to determine which services to start and stop. A runlevel is a predefined state of the system, where only a specific set of services are running. SystemV has seven runlevels, numbered 0-6, where 0 represents the system shut down state, and 6 represents the system reboot state.

Level 0

Level 1

Level 2

Level 3

Level 4

Level 5

Level 6

Debian

http://www.debian.org/doc/debian-policy/#contents

Use update-rc.d to install and remove System V init scripts.