I've modified generate_md5sum to look like this ... 
sub generate_md5sum
{
    my ($fname) = @_;

    my $sum = "file-not-readable               ";

    my $o_md5 = Digest::MD5->new;
    my $fh    = IO::File->new;
    if ( open( $fh, "+<", $fname ) )
    {
        if ( flock( $fh, LOCK_EX | LOCK_NB ) )
        {
            binmode($fh);
            $sum = $o_md5->addfile($fh)->hexdigest();
            flock( $fh, LOCK_UN );
            close $fh;

            if ($b_dups)
            {
                $h_sums ||= {};
                my $a_files = $h_sums->{$sum} ||= [];
                push @$a_files, $fname;
            }
        }
    }
    return $sum;
}

[download]
Which allows the script to continue over locked or unreadable files. Is this a good solution to this problem ?

In reply to Re^2: MD5 checksums for Windows by aussiecoder
in thread MD5 checksums for Windows by golux

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