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Copy last 30 minutes' contents from a log file

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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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LEARN ABOUT HPUX

svcdumplog

svcdumplog(1m)															    svcdumplog(1m)

NAME

       svcdumplog - Prints contents of a binary serviceability log file

SYNOPSIS

       svcdumplog [-s num_of_entries] logfile

OPTIONS

       The -s flag tells svcdumplog to skip the first num_of_entries log entries before printing, where num_of_entries is a number.

DESCRIPTION

       The svcdumplog program will print the contents of a binary log file.

       DCE  components	log  important	information about their activities and state via the DCE serviceability interface. The log messages can be
       routed as desired via the dcecp log object. The messages can also be written in either binary or in text format (information about specify-
       ing  message  format can be found in svcroute(5)). When binary format has been specified for a component's messages, each log entry will be
       written as a binary record of data defined (in dce/svclog.h) as the contents of the serviceability prolog structure. The svcdumplog utility
       will print the contents of such a binary log file as readable text.

RELATED INFORMATION

       dce_svc_log_get(3), dce_svc_log_close(3), dce_svc_log_open(3), dce_svc_log_rewind(3), svcroute(5), log(1m)

       Books: OSF DCE Porting and Testing Guide, OSF DCE Application Development Guide

																    svcdumplog(1m)