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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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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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