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Top Forums UNIX for Beginners Questions & Answers Copy last 30 minutes' contents from a log file Post 303040260 by Chubler_XL on Friday 25th of October 2019 04:22:59 PM
Old 10-25-2019
Assumption is that if a logrotation occurs the resulting file will be smaller that the last run.
This is identified with [ $EndLine -lt $StartLine ] && StartLine=0

On systems I have worked with log files grow at a fairly consistent rate and logrotation only occurs every week.

Not to say it's impossible but and I've never encountered a file that got truncated and then grew bigger than it's previous size within 30mins.
 

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TORRUS_MONITOR(8)						      torrus							 TORRUS_MONITOR(8)

NAME
monitor - Torrus Monitor. SYNOPSIS
torrus monitor --tree=TREENAME [options...] DESCRIPTION
This command starts the Monitor process for the tree TREENAME. By default it forks into a daemon, sets the log output file to /var/log/torrus/monitor.TREENAME.log, performs one monitoring cycle, and sleeps until the next cycle is scheduled. In daemon mode the log file can be reopened by sending it a SIGHUP signal. OPTIONS
--nodaemon Prevents the process from becoming a daemon and sets the log to STDERR. --runonce Instructs the script to run once and exit. Implies --nodaemon. --delay=N Makes the daemon sleep for N minutes before starting the first cycle. This would happen on the daemon startup and also after each configuration recompilation. For example, when monitor and collector start simultaneously, the collector needs some time to retrieve the data being monitored. --debug Sets the log level to debug. --verbose Sets the debug level to info. --help Displays a help message. FILES
/etc/torrus/conf/torrus-siteconfig.pl Torrus site configuration script. /var/log/torrus/monitor.TREENAME.log Monitor's log for the tree TREENAME. SEE ALSO
torrus(8) NOTES
See more documentation at Torrus home page: http://torrus.org AUTHOR
Stanislav Sinyagin <ssinyagin@yahoo.com> torrus 2.03 2013-07-26 TORRUS_MONITOR(8)
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