Good morning moesplace,

as I have to admit that I just overread a part of your requirement I got the feeling that I'm in dept showing a building block for another way of solving your issue. Some other Monks gave different advices and hints. Mine here is a little different as it uses DateTime and DateTime::Duration to explicitly loop over every day in between your start and end date. So, probably another way to look at your problem. And definitely a Perlish solution showing regexes, using top rated modules, operator overloading:

#!/usr/bin/perl
use strict;
use warnings;
use DateTime;
use 5.010;

die "ERROR: You have to provide start- and end-date in format 'YYYYMMD
+D'"
    if @ARGV != 2;

my $start_date = $ARGV[0];
my $end_date = $ARGV[1];

my $start_year = 1900;
my $start_month = 01;
my $start_day = 01;

my $end_year = 2100;
my $end_month = 01;
my $end_day = 01;


if($start_date =~ m/^([0-9][0-9][0-9][0-9])([0-9][0-9])([0-9][0-9])$/)
+ {
    $start_year = $1;
    $start_month = $2;
    $start_day = $3;
}
else {
    die "ERROR: Start Date doesn't match YYYYMMDD";
}
if($end_date =~ m/^([0-9][0-9][0-9][0-9])([0-9][0-9])([0-9][0-9])$/) {
    $end_year = $1;
    $end_month = $2;
    $end_day = $3;
}
else {
    die "ERROR: End Date doesn't match YYYYMMDD";
}

my $start = DateTime->new(
    year => $start_year,
    month => $start_month,
    day => $start_day,
);

my $end = DateTime->new(
    year => $end_year,
    month => $end_month,
    day => $end_day,
);

if($end < $start) {
    die "ERROR: end date is less than start date.";
}

my $one_day = DateTime::Duration->new(days => 1);

for(my $i = $end; $i >= $start; $i -= $one_day) {
    my $output = sprintf('%04d%02d%02d',
        $i->year,
        $i->month,
        $i->day,
    );
    say $output;
    # Check if path exists
    # chdir to it
    # do what you want
    # chdir back
}

[download]

Best regards
McA

UPDATE: The driver in this solution are the generated dates and not the files found which than get compared to the start- and end-date.

In reply to Re^2: processing dates as directories by McA
in thread processing dates as directories by moesplace

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