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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:
 

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XCALEV(1)						      General Commands Manual							 XCALEV(1)

NAME
xcalev - load xcal calendar files with regular dates SYNTAX
xcalev [ -r ][ -x ][ -f file ][ -d dir ][ year ] DESCRIPTION
Xcalev is used to preload the calendar files for the xcal program with regular events in your life. It reads lines from a file (usually called regular stored in your Calendar directory. Each line in the file contains three fields separated by spaces or tabs, these are: a month name, a day in the month and some text. For example: December 25 Christmas Dec 31 New Year's Eve The order of the month and the day are optional, the program deduces the day by looking whether the string contains an initial numeric character or not. The year defaults to the current year unless the program is given a year number as an argument. This year cannot be abbreviated to two digits because xcal deals with years from year zero. There's a rough validity check on this. The string from the data line is inserted in the appropriate file and will appear in your xcal date strip. Nothing will happen if the string already exists in the file for that day. This means that it's safe to run xcalev at any time, only the strings that have altered in the regular file will be updated. To help with entering the same event for a number of days in one month, you can give a day range with a hyphen Jan 16-21 Usenix SF If you supply the -r option, xcalev will delete all the matching strings that it finds in the appropriate daily file. So, if you want to make radical changes to the regular file, you should run xcalev with the -r option to remove all the current entries from one year, edit the regular file and run xcalev to reload things. OPTIONS
The -r option makes xcalev delete rather than append entries. The -x option makes xcalev operate with Calendar files that are compatible with the xcalendar program. The -f switch is followed by a filename gives an alternative name for the regular file. If the filename does not start with a slash or a dot, then the name of your Calendar directory will be prepended to it. The -d switch is followed by a directory name and specifies an alterative location for your Calendar directory. Your home directory is prepended if the name doesn't start with a slash or a dot. FILES
$HOME/Calendar/* xc<dd><Mon><Year> A data file is day, Month in three letter format and the year. xy<Year> A year directory. xw<Day> A data file for the weekly code, one per day. SEE ALSO
xcal(1), xcalpr(1), xcal_cal(1) AUTHOR
Copyright 1993 by Peter Collinson, Hillside Systems All rights reserved. X Version 11 R5 October 1993 XCALEV(1)
All times are GMT -4. The time now is 01:31 AM.
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