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BSD 2.11 - man page for rc (bsd section 8)

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

rc - command script for auto-reboot and daemons
/etc/rc /etc/rc.local
Rc is the command script which controls the automatic reboot and rc.local is the script holding commands which are pertinent only to a spe- cific site. When an automatic reboot is in progress, rc is invoked with the argument autoboot and runs a fsck with option -p to ``preen'' all the 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. The second part of rc, which is run after a auto-reboot succeeds and also if rc is invoked when a single user shell terminates (see init(8)), starts all the daemons on the system, preserves editor files and clears the scratch directory /tmp. Rc.local is executed immedi- ately before any other commands after a successful fsck. Normally, the first commands placed in the rc.local file define the machine's name, using hostname(1), and save any possible core image that might have been generated as a result of a system crash, savecore(8). The latter command is included in the rc.local file because the directory in which core dumps are saved is usually site specific.
init(8), reboot(8), savecore(8)
4th Berkeley Distribution April 27, 1985 RC(8)