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/etc/init.d is a directory containing initialization and termination scripts for changing init
states. These scripts are linked when appropriate to files in the rc?.d directories, where `?' is a single character corresponding to the init state. See init(1M) for definitions of the states.
File names in rc?.d directories are of the form [SK]nn<init.d filename>, where S means start this job, K means kill this job, and nn is the relative sequence number for killing
or starting the job.
When entering a state (init S,0,2,3,etc.) the rc[S0-6] script executes those scripts in /etc/rc[S0-6].d that are prefixed with K followed by those scripts prefixed with S. When executing each script in one of the /etc/rc[S0-6] directories, the /sbin/rc[S0-6] script passes a single argument. It passes the argument 'stop' for scripts prefixed with K and the argument 'start' for scripts prefixed with S. There is no harm in applying the same sequence number to multiple
scripts. In this case the order of execution is deterministic but unspecified.
Guidelines for selecting sequence numbers are provided in README files located in the directory associated with that target state. For example, /etc/rc[S0-6].d/README. Absence of a README file indicates that there are currently no established
guidelines.
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