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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 303043479 by mukulverma2408 on Wednesday 29th of January 2020 11:56:01 AM
Old 01-29-2020
Dear Experts,
This is what I've tried by converting into epoch time and it's giving me the desired result however it seems to me like this is not the standard way of doing this, do you mind taking a look and improve this solution pls.
Code:
dt1=`date -d 'Jan 19 21:15:00' +%s`
#echo $dt1
while read line
do
	tmstmp=$(echo $line | cut -c '1-15' )
	#echo $tmstmp
	dt2=`date -d "$tmstmp" +%s`
	#echo  $dt2
	echo "Ref time in epoch is $dt1"
	echo "Timestamp from file is $tmstmp"
	echo "Timestamp from file in epoch is $dt2"
	if [[ $dt2 -le $dt1 ]]
	then
		echo "This event occured before 21:15, inserting into new log file"
		echo $line >> filter.txt
	else
		continue 
		
	fi		
	
done < auth.log

 

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LEARN ABOUT DEBIAN

shtool-echo

SHTOOL-ECHO.TMP(1)					      GNU Portable Shell Tool						SHTOOL-ECHO.TMP(1)

NAME

       shtool-echo - GNU shtool echo(1) extensional command

SYNOPSIS

       shtool echo [-n|--newline] [-e|--expand] string

DESCRIPTION

       shtool echo is an echo(1) style command which prints string to stdout and optionally provides special expansion constructs (terminal bold
       mode, environment details, date, etc) and newline control. The trick of this command is that it provides a portable -n option and hides the
       gory details needed to find out the environment details under option -e.

OPTIONS

       The following command line options are available.

       -n, --newline
	   By default, output is written to stdout followed by a "newline" (ASCII character 0x0a). If option -n is used, this newline character is
	   omitted.

       -e, --expand
	   If option -e is used, string can contain special "%x" constructs which are expanded before the output is written. Currently the
	   following constructs are recognized:

	   %B  switch terminal mode to bold display mode.

	   %b  switch terminal mode back to normal display mode.

	   %u  the current user name.

	   %U  the current user id (numerical).

	   %g  the current group name.

	   %G  the current group id (numerical).

	   %h  the current hostname (without any domain extension).

	   %d  the current domain name.

	   %D  the current day of the month.

	   %M  the current month (numerical).

	   %m  the current month name.

	   %Y  the current year.

EXAMPLE

	#   shell script
	shtool echo -n -e "Enter your name [%B%u%b]: "; read name
	shtool echo -e "Your Email address might be %u@%h%d"
	shtool echo -e "The current date is %D-%m-%Y"

HISTORY

       The GNU shtool echo command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Website META Language (WML)
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SEE ALSO

       shtool(1), echo(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-ECHO.TMP(1)
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