Content in Linux/etc/rc. d

There are a number of directories under/etc/rc. d that look like RC ?. D (where? Is the number of the run-level) and rcsysinit. D, all containing a number of symbolic links. Some begin withK, The others begin withS, And all of them have two numbers following the initial letter. the K means to stop (kill) a service and the s means to start a service. the numbers determine the order in which the scripts are run, from 00 to 99-the lower the number the earlier it gets executed. whenInitSwitches to another run-level, the appropriate services are either started or stopped, depending on the runlevel chosen.