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Top Forums Shell Programming and Scripting Delete lines in a file by date on the line Post 302488982 by rdcwayx on Wednesday 19th of January 2011 05:53:46 AM
Old 01-19-2011
If your date command don't support -d option, then use perl to calculate the passed date.
Code:
$ cat days_ago
days_ago()
{
  perl -e  '
        # take 86400 * # of days from right now in epoch seconds
                 $yestertime = time - (86400 * $ARGV[0]);
                 $month = (localtime $yestertime)[4] + 1;
        # day of the month
                 $day = (localtime $yestertime)[3];
        # year
                 $year = (localtime $yestertime)[5] + 1900;
        # US format mm dd yyyy
                 printf( "%4d%02d%02d", $year, $month, $day);  '  $1
}

days_ago $1

Code:
awk -F "[|\/]" -vD=$(./days_ago 30) '$NF$(NF-1)$(NF-2)>D'  infile

This User Gave Thanks to rdcwayx For This Post:
 

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Time::CTime(3pm)					User Contributed Perl Documentation					  Time::CTime(3pm)

NAME
Time::CTime -- format times ala POSIX asctime SYNOPSIS
use Time::CTime print ctime(time); print asctime(localtime(time)); print strftime(template, localtime(time)); strftime conversions %% PERCENT %a day of the week abbr %A day of the week %b month abbr %B month %c ctime format: Sat Nov 19 21:05:57 1994 %d DD %D MM/DD/YY %e numeric day of the month %f floating point seconds (milliseconds): .314 %F floating point seconds (microseconds): .314159 %h month abbr %H hour, 24 hour clock, leading 0's) %I hour, 12 hour clock, leading 0's) %j day of the year %k hour %l hour, 12 hour clock %m month number, starting with 1, leading 0's %M minute, leading 0's %n NEWLINE %o ornate day of month -- "1st", "2nd", "25th", etc. %p AM or PM %r time format: 09:05:57 PM %R time format: 21:05 %S seconds, leading 0's %t TAB %T time format: 21:05:57 %U week number, Sunday as first day of week %v DD-Mon-Year %w day of the week, numerically, Sunday == 0 %W week number, Monday as first day of week %x date format: 11/19/94 %X time format: 21:05:57 %y year (2 digits) %Y year (4 digits) %Z timezone in ascii. eg: PST DESCRIPTION
This module provides routines to format dates. They correspond to the libc routines. &strftime() supports a pretty good set of coversions -- more than most C libraries. strftime supports a pretty good set of conversions. The POSIX module has very similar functionality. You should consider using it instead if you do not have allergic reactions to system libraries. GENESIS
Written by David Muir Sharnoff <muir@idiom.org>. The starting point for this package was a posting by Paul Foley <paul@ascent.com> LICENSE
Copyright (C) 1996-2010 David Muir Sharnoff. Copyright (C) 2011 Google, Inc. License hereby granted for anyone to use, modify or redistribute this module at their own risk. Please feed useful changes back to cpan@dave.sharnoff.org. perl v5.12.3 2011-05-12 Time::CTime(3pm)
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