#!/usr/local/perl -w use strict; my $file ='current.txt'; my $daystokeep = $ARGV[0]; my $secs_to_keep = $daystokeep * 3600 * 24; my $now = time(); my $earliest = $now - $secs_to_keep; my $file_size = -s $file; my $top = 0; my $bottom = $file_size; my $count = 0; my $max_tries = 100; open (OLD, "$file") or die $!; open (NEW, ">new.txt") or die $!; while (++$count) { my $middle = int (($top + $bottom) / 2); seek OLD, $middle, 0; my $partial = ; my $full = ; my $next = ; if (((linesecs($full)) < $earliest) && ((linesecs($next)) > $earliest)) { print NEW $next; print NEW while ; exit; } if ((linesecs($full)) < $earliest) { $top = $middle; } else { $bottom = $middle; } } close OLD; close NEW;