04-30-2020
Could you store a 'previous last line' value somewhere to use between runs? That way you could:-
- Copy the log file to a temporary directory (to get a fixed file to work with)
- Read the 'previous last line' value from your stored location
- Count the lines in your copied file.
- If the count is lower, you have rotated the log file, so set the 'previous last line' value to zero to read the whole file.
- If the count was larger, read from the 'previous last line' value to the end of the file looking for the error message being logged.
- Store the new 'last line' value in a file somewhere for the next run.
- Tidy up your temporary file/directory.
Would that logic work for you?
Let us know if that helps, is totally wrong or if you get stuck.
I hope that this helps,
Robin
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LEARN ABOUT LINUX
aptitude-run-state-bundle
APTITUDE-RUN-ST(1) Command-line reference APTITUDE-RUN-ST(1)
NAME
aptitude-run-state-bundle - unpack an aptitude state bundle and invoke aptitude on it
SYNOPSIS
aptitude-run-state-bundle [<options>...] <input-file> [<program> [<arguments>...]]
DESCRIPTION
aptitude-run-state-bundle unpacks the given aptitude state bundle created by aptitude-create-state-bundle(1) to a temporary directory,
invokes <program> on it with the supplied <arguments>, and removes the temporary directory afterwards. If <program> is not supplied, it
defaults to aptitude(8).
OPTIONS
The following options may occur on the command-line before the input file. Options following the input file are presumed to be arguments to
aptitude.
--append-args
Place the options that give the location of the state bundle at the end of the command line when invoking <program>, rather than at the
beginning (the default is to place options at the beginning).
--help
Display a brief usage summary.
--prepend-args
Place the options that give the location of the state bundle at the beginning of the command line when invoking <program>, overriding
any previous --append-args (the default is to place options at the beginning).
--no-clean
Do not remove the unpacked state directory after running aptitude. You might want to use this if, for instance, you are debugging a
problem that appears when aptitude's state file is modified. When aptitude finishes running, the name of the state directory will be
printed so that you can access it in the future.
This option is enabled automatically by --statedir.
--really-clean
Delete the state directory after running aptitude, even if --no-clean or --statedir was supplied.
--statedir
Instead of treating the input file as a state bundle, treat it as an unpacked state bundle. For instance, you can use this to access
the state directory that was created by a prior run with --no-clean.
--unpack
Unpack the input file to a temporary directory, but don't actually run aptitude.
SEE ALSO
aptitude-create-state-bundle(1), aptitude(8), apt(8)
AUTHOR
Daniel Burrows <dburrows@debian.org>
Author.
COPYRIGHT
Copyright 2007 Daniel Burrows.
This manual page is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This manual page is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
aptitude-run-state-bundle 0.6. 08/08/2011 APTITUDE-RUN-ST(1)