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RC(8)			FreeBSD	System Manager's Manual			 RC(8)

     rc, rc.firsttime, rc.local, rc.securelevel	-- command scripts for system

     rc	is the command script that is invoked by init(8) when the system
     starts up.	 It performs system housekeeping chores	and starts up system
     daemons.  Additionally, rc	is intricately tied to the netstart(8) script,
     which runs	commands and daemons pertaining	to the network.	 rc is also
     used to execute any rc.d(8) scripts defined in rc.conf.local(8).  The
     rc.securelevel, rc.firsttime, and rc.local	scripts	hold commands which
     are pertinent only	to a specific site.

     All of these startup scripts are controlled to some extent	by variables
     defined in	rc.conf(8), which specify which	daemons	and services to	run.

     Before init(8) starts rc, it sets the process priority, umask, and	re-
     source limits according to	the "daemon" login class as described in
     login.conf(5).  It	then starts rc and attempts to execute the sequence of
     commands therein.

     The first part of rc runs an fsck(8) with option -p to "preen" all	disks
     of	minor inconsistencies resulting	from the last system shutdown and to
     check for serious inconsistencies caused by hardware or software failure.
     If	this auto-check	and repair succeeds, then the second part of rc	is
     run.  However, if the file	/fastboot exists, fsck will not	be invoked.
     The file is then removed so that fsck will	be run on subsequent boots.

     The second	part of	rc then	asks rc.conf(8)	for configuration variables,
     mounts filesystems, saves dmesg(8)	output to the file
     /var/run/dmesg.boot, starts system	daemons, preserves editor files,
     clears the	scratch	directory /tmp,	uses savecore(8) to save any possible
     core image	that might have	been generated as a result of a	system crash,
     and relinks kernel	objects	in a random order.

     If	at any point the boot script fails, init(8) enters single-user mode,
     allowing the superuser a shell on the console.  On	exiting	this mode,
     init again	invokes	rc, but	this time without performing the file system

     Before rc starts most system daemons, netstart(8) is executed.

     rc.securelevel is executed	by rc to start daemons that must be run	before
     the security level	changes.  Following this, rc then sets the security
     level to '1' if it	wasn't set already by rc.securelevel.  See
     securelevel(7) for	the effects of setting the security level.

     If	rc.firsttime exists, it	is executed once and then deleted.  Any	output
     is	mailed to root.

     rc.local is executed towards the end of rc	(it is not the very last as
     there are a few services that must	be started at the very end).  Nor-
     mally, rc.local contains commands and daemons that	are not	part of	the
     stock installation.

     /etc/netstart	    Command script for network startup.
     /etc/rc		    Command scripts for	system startup.
     /etc/rc.conf	    System daemon configuration	database.
     /etc/rc.conf.local	    Site specific daemon configuration database.
     /etc/rc.d		    Directory to hold rc.d(8) scripts.
     /etc/rc.d/rc.subr	    Functions used by the rc.d(8) scripts.
     /etc/rc.firsttime	    Commands run on the	first boot after creation.
     /etc/rc.local	    Site specific command scripts for system startup.
     /etc/rc.securelevel    Commands run before	the security level changes.
     /etc/rc.shutdown	    Commands run at system shutdown.
     /etc/examples/rc.*	    Examples of	site specific scripts.
     /fastboot		    Tells rc not to run	fsck(8)	during the next	boot.
     /var/run/dmesg.boot    Copy of dmesg(8) saved by rc at boot time.

     sysctl.conf(5), securelevel(7), init(8), netstart(8), rc.conf(8),
     rc.d(8), rc.shutdown(8), rcctl(8)

     The rc command appeared in	4.0BSD.

FreeBSD	13.0		       February	10, 2020		  FreeBSD 13.0


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