savecore - save a core dump of the operating system
savecore [-fvz] [-N system] directory
savecore copies the currently running kernel and its associated core dump
into directory, and enters a reboot message and information
core dump into the system log.
The options are as follows:
-c Clears the dump, so that future invocations of
savecore will ignore
-f Forces a dump to be taken even if the dump doesn't
or there is insufficient disk space.
Use system as the kernel instead of the default
-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
the system in directory/bsd.# (or in directory/bsd.#.core.Z
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
savecore also checks the available disk space before attempting to make
the copies. If there is insufficient disk space in the
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
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
savecore is meant to be called near the end of the initialization file
/etc/rc (see rc(8)).
/bsd current kernel
The savecore command appeared in 4.1BSD.
The minfree code does not consider the effect of compression.
OpenBSD 3.6 June 5, 1993
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