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Full Discussion: Filter records from a log file based on timestamp
Top Forums UNIX for Beginners Questions & Answers Filter records from a log file based on timestamp Post 303043487 by Chubler_XL on Wednesday 29th of January 2020 03:32:57 PM
Old 01-29-2020
That looks like a good approach.

You could get some more efficiency by not calling the date external on each input line and using bash to convert the date time to an mmddHHMMSS number for direct comparison like this:

Code:
#!/bin/bash
function convdtime {
    w="JanFebMarAprMayJunJulAugSepOctNovDec"
    t=${w%%$1*}
    printf -v when "%d%02d%02d%02d%02d\n"  $((${#t}/3 + 1)) $2 ${3//:/ }
}

convdtime Jan 19 21:15:00
start=$when

while read mth day time rest
do
   convdtime $mth $day $time
   if [[ $when -le $start ]]
   then
       echo "This event occured before 21:15, inserting into new log file"
       echo "$mth $day $time $rest" >> filter.txt
   else
      break
   fi
done < auth.log

If file is sorted you can save processing additional lines by using break instead of continue once you are past the target datetime.

Edit: This will have issues around end of calendar year where Dec 31 will appear to be greater than Jan 1
Last edited by Chubler_XL; 01-29-2020 at 04:39 PM..
This User Gave Thanks to Chubler_XL For This Post:
mukulverma2408
 

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LEARN ABOUT OSX

svk::log::filter::xml

SVK::Log::Filter::XML(3)				User Contributed Perl Documentation				  SVK::Log::Filter::XML(3)

NAME

       SVK::Log::Filter::XML - display log messages in XML format

SYNOPSIS

	   > svk log --xml
	   <?xml version="1.0" encoding="utf-8"?>
	   <log>
	   <logentry revision="1234" original="456">
	   <author>author</author>
	   <date>2006-05-16T15:43:28.889532Z</date>
	   <msg>This is the commit message for the revision.</msg>
	   </logentry>
	   </log>
	   > svk log --output xml
	   ...

DESCRIPTION

       The XML filter is an output filter for displaying log messages in XML format.  The organization of the XML format should be self-
       explanatory after a little experimentation.  The format is designed to be compatible with Subversion's XML output, so you should be able to
       use tools like <http://ch.tudelft.nl/~arthur/svn2cl/> without any modification.	However, since SVK supports arbitary log filters (see
       SVK::Log::Filter for details on writing one), it may be easier to write your own output format than to process the XML.

       This filter is invoked implicitly when you specify the "--xml" argument to SVK's log command.  Two arguments to the log command modify
       XML's behavior.

       quiet

       Providing this command-line option to the log command prevents the XML filter from displaying the contents of the log message.  All other
       information is displayed as usual.

       verbose

       Providing this command-line option to the log command makes the XML filter display history information for each revision.  The history
       includes the kind of modification (modify, add, delete) and any copy history for each path that was modified in the revision.

STASH
/PROPERTY MODIFICATIONS
       XML leaves all properties and the stash intact.

perl v5.10.0							    2008-08-04						  SVK::Log::Filter::XML(3)
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