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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 MOJAVE

widget_calendar

widget_calendar(n)					    widget::calendar Megawidget 					widget_calendar(n)

__________________________________________________________________________________________________________________________________________________

NAME

       widget_calendar - widget::calendar Megawidget

SYNOPSIS

       package require Tcl  8.4

       package require Tk  8.4

       package require widget  ?3.0?

       widget::calendar pathname ?options?

_________________________________________________________________

DESCRIPTION

       This package provides a calendar megawidget (snidget).

       widget::calendar pathname ?options?

WIDGET OPTIONS

       -command
	      A script to evaluate when a date was selected.

       -dateformat
	      The format of the date that is returned. Default: %m/%d/%Y.

       -firstday
	      Set first day the week, Either sunday or monday. It defaults to monday.

       -font  Select the font used in the widget. It defaults to Helvetica 9.

       -highlightcolor
	      Selects the background color for the day that has been selected. Default: #FFCC00

       -language
	      Specify  language of the calendar contents. The language is specified by abbreviations of the languge, for example: en - english, de
	      - german ...  It defaults to en.

	      Supported languages: en, de, fr, it, es, pt, ru, sv, zh, fi

       -shadecolor
	      Selects the color of the parts that have a shaded background. Default: #888888

       -showpast
	      Specify if the past shall be shown. It is a boolean value and defaults to 1.

       -textvariable
	      Specifies the name of a variable whose value is linked to the entry widget's contents.  Whenever the  variable  changes  value,  the
	      widget's contents are updated, and vice versa.

WIDGET COMMAND

       pathname get ?what?

       Returns	a  part  of  the  selected date or 'all'. The argument what selects the part. Valid values for what are: day, month, year and all.
       'all' is the default and returns the complete date in the format given with -dateformat.

DEFAULT BINDINGS

       On creation of the calendar widget the following bindings are installed.

       o      Up - Move to week before current date

       o      Down - Move to week after current date

       o      Left - Move to day before current date

       o      Right - Move to day after current date

       o      Control-Left - Move to month before current date

       o      Control-Right - Move to month after current date

       o      Control-Up - Move to year before current date

       o      Control-Down - Move to year after current date

EXAMPLE

	   package require widget::calendar ; # or widget::all
	   set t [widget::calendar .t]
	   pack $t -fill x -expand 1

KEYWORDS

       megawidget, snit, widget

widget								       0.93							widget_calendar(n)
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