initscripts | Scripts for initializing and shutting down the system | Mehr ...
The scripts in this package initialize a standard Debian GNU/Linux system at boot time and finalize it at halt or reboot time.
sysv-rc | System-V-like runlevel change mechanism | Mehr ...
This package provides support for the System-V like system for booting, shutting down and changing runlevels, configured through symbolic links in /etc/rc?.d/.
sysvinit | System-V-like init utilities | Mehr ...
This package contains programs required for booting a Debian system and doing basic process management. . The most important program in the package is /sbin/init. It is the first process started on boot and continues to run as process number 1 until the system halts. All other processes are descended from it.
sysvinit-utils | System-V-like utilities | Mehr ...
This package contains the important System-V-like utilities. . Specifically, this package includes: killall5, last, lastb, mesg, pidof, sulogin