About Initialization
Linux can use either System V (SysV) style system initialization or BSD style initialization. These are the two primary methods of performing system initialization in the UNIX and Linux worlds. BSD uses a few large scripts to handle all system initialization. The BSD initialization is used only by the Slackware distribution. SysV makes use of runlevels and a group of initialization scripts. The initialization scripts are run to start and stop daemons (background processes) depending on the runlevel (also referred to as the system state). One script per daemon or process subsystem is kept in a centralized directory (to be examined in detail later). System V runlevels range from 0–6 by custom, with each runlevel corresponding ...
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