savecore man page on OpenBSD

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SAVECORE(8)		OpenBSD System Manager's Manual		   SAVECORE(8)

     savecore - save a core dump of the operating system

     savecore [-cfvz] [-N system] directory

     savecore copies the currently running kernel and its associated core dump
     into directory, and enters a reboot message and information about the
     core dump into the system log.

     The options are as follows:

     -c	     Clears the dump, so that future invocations of savecore will
	     ignore it.

     -f	     Forces a dump to be taken even if the dump doesn't appear correct
	     or there is insufficient disk space.

     -N system
	     Use system as the kernel instead of the default /bsd.

     -v	     Prints out some additional debugging information.

     -z	     Compresses the core dump and kernel (see compress(1)).

     savecore checks the core dump in various ways to make sure that it is
     current and that it corresponds to the currently running system.  If it
     passes these checks, it saves the core image in directory/bsd.#.core and
     the system in directory/bsd.# (or in directory/bsd.#.core.Z and
     directory/bsd.#.Z, respectively, if the -z option is used).  The ``#'' is
     the number from the first line of the file directory/bounds, and it is
     incremented and stored back into the file each time savecore successfully

     savecore also checks the available disk space before attempting to make
     the copies.  If there is insufficient disk space in the filesystem
     containing directory, or if the file directory/minfree exists and the
     number of free kilobytes (for non-superusers) in the filesystem after the
     copies were made would be less than the number in the first line of this
     file, the copies are not attempted.

     If savecore successfully copies the kernel and the core dump, the core
     dump is cleared so that future invocations of savecore will ignore it.

     savecore is meant to be called near the end of the initialization file
     /etc/rc (see rc(8)).

     /bsd    current kernel

     compress(1), crash(8), syslogd(8)

     The savecore command appeared in 4.1BSD.

     The minfree code does not consider the effect of compression.

OpenBSD 4.9		      September 10, 2008		   OpenBSD 4.9

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