savecore man page on FreeBSD

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

NAME
     savecore — save a core dump of the operating system

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

DESCRIPTION
     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
     director/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)).

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

HISTORY
     The savecore utility appeared in 4.1BSD.

     Support for kernel textdumps appeared in FreeBSD 7.1.

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

BSD			       December 24, 2008			   BSD
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