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When the init process runs a Kill script, it calls the script that the link points to with the argument stop. Start and Kill scripts usually have numbers after the S or K. This number signifies the relative order that the scripts are executed in. A lower number means that the scripts are executed earlier than one with a higher number when entering or leaving a runlevel. Sequencing Start and Kill scripts is a very significant part of the boot process. If a service needs the network to be initialized before it can run (for example, the Apache web server), then its start order will have to be higher than that of the network. Similarly, to cleanly shut down Apache, you would have to have it shut down before the network when leaving the runlevel. When all the Start scripts associated with a specific runlevel have finished executing, the system is said to be in runlevel x. This means it has successfully completed initializing all associated services and is now in the specified runlevel. When the system is in a specific runlevel, you can control a switch to another runlevel with the init or telinit processes. If you were in runlevel 5 and wished to cleanly shut down X Windows and move to runlevel 3, you would issue the command init 3. If you wanted to be able to wait ten seconds before beginning to move to runlevel 3, you would issue the command telinit -t 10 3. Thinking back, you should now be able to trace what the init program does with regards to these init scripts (a common name for runlevel scripts). The init process executes all of the scripts in sequence in the directory /etc/rc.d/rc5.d that start with a K in the order of the numbering in the filename. When it has finished killing processes, it then runs all of the scripts in /etc/rc.d/rc3.d that begin with an S in the sequence specified by the filename numbering. When it has completed these Start scripts, the system will successfully be in runlevel 3. If there are services that should be running in runlevel 3 that were running in runlevel 5, the system is clever enough to not kill off those services and allows them to continue because it knows those services are common to both runlevels.
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Those of you familiar with Red Hat may recognize the chkconfig system script. This is a program that allows you to add and remove services from the runlevel directory of a specific runlevel. If this program did not exist, you could create your own links to move from one runlevel to another for example, in the directory /etc/init.d/rc3.d or /etc/rc.d/rc3.d (these are the same directory) to /etc/init.d to make sure a process starts and stops in an order you dictate. The services that you can control with the chkconfig command are all of the scripts in the /etc/init.d directory. The chkconfig command takes a few arguments that you will probably use quite a lot. To list all of the applications in runlevels that are controlled by init with details of whether they are on (started in a runlevel) or off (not started in a runlevel), you can just run chkconfig --list.
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Tip When you are viewing all the output of chkconfig -list, you will see a list of all processes controlled by init with their status scroll by on the screen. You can use the pipe (|) process to push the output through less by issuing chkconfig -list | less. This will enable you to move up and down with the cursor keys and see all of the output regardless of whether the output is longer than the screen you are viewing it on. This is something that can be used with any textual output that scrolls past you because there is too much data. You can read more about less and other common command-line activities you might want to perform on a regular basis in 2.
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