Debian :: update-rc.d instead of chkconfig + sysv-rc-config
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chkconfig is a redhat startup configuration utitility, update-rc.d is the debian start up command utility.

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A system tool for maintaining the /etc/rc*.d hierarchy.
Chkconfig is a basic system utility. It updates and queries runlevel
information for system services. Chkconfig manipulates the numerous
symbolic links in /etc/rc.d, to relieve system administrators of some
of the drudgery of manually editing the symbolic links.

More on the boot processes of Linux .

That's a pretty in depth article, explains the whole init.d, rc etc.
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The init process is the last step in the boot procedure and identified by process id "1". Init is responsible for starting system processes as defined in the /etc/inittab file. Init typically will start multiple instances of "getty" which waits for console logins which spawn one's user shell process. Upon shutdown, init controls the sequence and processes for shutdown. The init process is never shut down. It is a user process and not a kernel system process although it does run as root.

You can also check out another very pleasant little utility:

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apt-get install sysv-rc-conf

When you run that it gives you a nice console screen of all the services you might want to control, like lisa, apache, ssh, cron, dbus, and so on. There are checkboxes for each runlevel that control when and where the process starts up.

It's a nice tool, easy to see where everything is at one look in terms of the system startup.
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