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

     savecore -- save a	core dump of the operating system

     savecore -c
     savecore -C [-v] [directory device]
     savecore [-fkvz] [directory [device ...]]

     The savecore utility copies a core	dump into directory, or	the current
     working directory if no directory argument	is given, and enters a reboot
     message and information about the core dump into the system log.

     The options are as	follows:

     -C	     Check to see if a dump exists, and	display	a brief	message	to
	     indicate the status.  An exit status of 0 indicates that a	dump
	     is	there, 1 indicates that	none exists.  This option is compati-
	     ble only with the [-v] option.

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

     -f	     Force a dump to be	taken even if either the dump was cleared or
	     if	the dump header	information is inconsistent.

     -k	     Do	not clear the dump after saving	it.

     -v	     Print out some additional debugging information.  Specify twice
	     for more information.

     -z	     Compress the core dump and	kernel (see gzip(1)).

     The savecore utility looks	for dumps on each device specified by the
     device argument(s), or on each device in /etc/fstab marked	as ``dump'' or
     ``swap''.	The savecore utility checks the	core dump in various ways to
     make sure that it is complete.  If	it passes these	checks,	it saves the
     core image	in directory/vmcore.# and information about the	core in
     directory/info.#.	For kernel textdumps generated with the	textdump(4)
     facility, output will be stored in	the tar(5) format and named
     directory/textdump.tar.#.	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 runs.

     The savecore utility also checks the available disk space before attempt-
     ing to make the copies.  If there is insufficient disk space in the file
     system containing directory, or if	the file directory/minfree exists and
     the number	of free	kilobytes (for non-superusers) in the file system
     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.

     The savecore utility is meant to be called	near the end of	the initial-
     ization file /etc/rc (see rc(8)).

     gzip(1), getbootfile(3), textdump(4), tar(5), dumpon(8), syslogd(8)

     The savecore utility appeared in 4.1BSD.

     Support for kernel	textdumps appeared in FreeBSD 7.1.

     The minfree code does not consider	the effect of compression or sparse

FreeBSD	11.0		       December	24, 2008		  FreeBSD 11.0


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