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

NAME
     savecore - save a core dump of the operating system

SYNOPSIS
     savecore -c
     savecore [-fkvz] [-N system] directory

DESCRIPTION
     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      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)).

     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/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 runs.

     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)).

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

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

HISTORY
     The savecore command appeared in 4.1BSD.

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

NAME | SYNOPSIS | DESCRIPTION | BUGS | SEE ALSO | HISTORY

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