Using a consistent algorithm may provide you with a consistent set of identical "rips" from your webpage. Just for a moment, lets consider that unlikely reality to be true.

You must combine the methods for parsing over all files in a directory with your comparison and sorting options.

The first line may not give you the best indication for comparison. I would suggest Digest::MD5 instead, and the following untested code - mostly ripped from the docs: 

use Digest::MD5;
use strict;

%seen = ();
$dirname = "/path/to/files";

# Parse over files in directory
opendir(DIR, $dirname) or die "can't open $dirname: $!";

# Take a careful look at each file in $dirname
while (defined($file = readdir(DIR))) {
    my $file = "$dirname/$file";
    open(FILE, $file) or die "Can't open '$file': $!";
    binmode(FILE);

    # make a $hash of each file
    my $hash = Digest::MD5->new->addfile(*FILE)->hexdigest, " $file\n"
+;

    # store a copy of this $hash and compare it with all others seen
    unless ($seen{$hash}++ {
        # this is a unique file
        # do something with it here - perhaps move it to a /unique loc
+ation
    }
}
closedir(DIR);

[download]
...code is untested

SciDude
The first dog barks... all other dogs bark at the first dog.

In reply to Re: Verifying data in large number of textfiles by SciDude
in thread Verifying data in large number of textfiles by dchandler

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