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Top Forums UNIX for Dummies Questions & Answers Script to search log file for last 15 mins data Post 302956794 by methyl on Saturday 3rd of October 2015 08:09:52 PM
Old 10-03-2015
Quote:
I strongly suggest that instead of trying to match based on timestamps you instead keep track of the line number of the last line processed in the previous run and on the next run just start processing with the next line in that log file. Doing it this way will keep you from missing events and keep you from processing some events twice.
Furthur to Don_Cragun, and if I have understood the task correctly.

You need a script running under cron every 15 minutes which copies the current logfile and compares the line count with the previous version of the logfile. The script then processes the "tail -#" number of lines difference.

This is a basic technique to avoid "tail -f" on logfiles which will get deleted by log rotation scripts. It also avoids reading the logfile and processing all the timestamps in the logfile.

Don't forget the "first time" condition when the T-15 minutes copy does not exist. Your first run of the cron will just prepare the files.
 

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LOGSAVE(8)						      System Manager's Manual							LOGSAVE(8)

NAME
logsave - save the output of a command in a logfile SYNOPSIS
logsave [ -asv ] logfile cmd_prog [ ... ] DESCRIPTION
The logsave program will execute cmd_prog with the specified argument(s), and save a copy of its output to logfile. If the containing directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out. A copy of the output will also be written to standard output. If cmd_prog is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in logfile logsave is useful for saving the output of initial boot scripts until the /var partition is mounted, so the output can be written to /var/log. OPTIONS
-a This option will cause the output to be appended to logfile, instead of replacing its current contents. -s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file. -v This option will make logsave to be more verbose in its output to the user. AUTHOR
Theodore Ts'o (tytso@mit.edu) SEE ALSO
fsck(8) E2fsprogs version 1.42.9 December 2013 LOGSAVE(8)
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