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You can identify duplicate files using the following command: md5sum * | sort -k1 | uniq -w 32 -d


I'm working on Linux, which means the is the command md5sum which outputs: > md5sum * d41d8cd98f00b204e9800998ecf8427e file_1 d41d8cd98f00b204e9800998ecf8427e file_10 d41d8cd98f00b204e9800998ecf8427e file_2 d41d8cd98f00b204e9800998ecf8427e file_3 d41d8cd98f00b204e9800998ecf8427e file_4 d41d8cd98f00b204e9800998ecf8427e file_5 ...


I would offer perl as a solution. There's a module called CAM::PDF which allows you to extract ... PDF content. It works a little like this: #!/usr/bin/perl use strict; use warnings; use CAM::PDF; my $file = 'sample.pdf'; my $pdf = CAM::PDF->new($file); my $word_count = 0; for my $pagenum ( 1 .. $pdf->numPages ) { my $page_text = ...


Since different publishers use different methods of "marking" the PDFs you need to make sure you compare without taking the markings into account. You also need an efficient method to compare a new PDF to all already downloaded PDFs in case you repeatedly download the same PDF and it is e.g. marked with the IP and/or date-time-stamp as you suggest. You ...

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