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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 [-fkvz] [-N system] directory

     The savecore utility 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      Clear the dump, so that future invocations of savecore will
             ignore it.

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

     -k      Do not clear the dump after saving it.

     -N      Use system as the kernel instead of the running kernel (as
             determined from getbootfile(3)).

     -v      Print out some additional debugging information.

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

     The savecore utility 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/vmcore.# and the system in directory/kernel.# 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

     The savecore utility 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.

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

     The minfree code does not consider the effect of compression.

     gzip(1), getbootfile(3), dumpon(8), syslogd(8)

     The savecore utility appeared in 4.1BSD.

FreeBSD 11.0-PRERELEASE       September 23, 1994       FreeBSD 11.0-PRERELEASE


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