02-28-2008
During a normal reboot the wtmp file is not cleared, so perhaps it was due to the upgrade or some other effect (deleted somehow by a process started from inittab, a process in the k-scripts in /etc/rc.d of runlevel 2 or something such).
bakunin
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relup(5) Files relup(5)
NAME
relup - Release upgrade file
DESCRIPTION
The release upgrade file describes how a release is upgraded in a running system.
This file is automatically generated by systools:make_relup/3,4 , using a release resource file ( .rel ), application resource files ( .app
) and application upgrade files ( .appup ) as input.
FILE SYNTAX
In a target system, the release upgrade file should be located in the OTP_ROOT/erts-EVsn/Vsn directory.
The relup file contains one single Erlang term, which defines the instructions used to upgrade the release. The file has the following syn-
tax:
{Vsn,
[{UpFromVsn, Descr, Instructions}, ...],
[{DownToVsn, Descr, Instructions}, ...]}.
* Vsn = string() is the current version of the release.
* UpFromVsn = string() is an earlier version of the release to upgrade from.
* Descr = term() is a user defined parameter passed from the systools:make_relup/3,4 function. It will be used in the return value of
release_handler:install_release/1,2 .
* Instructions is a list of low-level release upgrade instructions, see appup(5) .
It consists of the release upgrade instructions from the respective application upgrade files (high-level instructions are translated
to low-level instructions), in the same order as in the start script.
* DownToVsn = string() is an earlier version of the release to downgrade to.
When upgrading from UpFromVsn with release_handler:install_release/1,2 , there does not have to be an exact match of versions, but
UpFromVsn can be a sub-string of the current release version.
SEE ALSO
app(5), appup(5), rel(5), release_handler(3erl), systools(3erl)
Ericsson AB sasl 2.1.9.3 relup(5)