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my @filelist = ('zip1.zip','zip2.zip','zip3.zip');

zip1.zip
-->file1.txt
...
-->file5.txt
-->file6.txt
-->file7.txt

bigzip.zip
-->zip1 (dir)
...
---->file5.txt
---->file6.txt
---->file7.txt

my $zip = Archive::Zip->new();
foreach (@filelist) {
...
        $zip->addMember( $_ );
    }
}

bigzip.zip
-->file1.txt
...
-->file5.txt
-->file6.txt
-->file7.txt

my $x=1;
my $zip = Archive::Zip->new();
...

    $x++;
}