use strict;
use warnings;
use File::Path 'mkpath';

my $stem = 'object';

my $highest = (
        sort {$b <=> $a}
        map { /(\d+)$/ ? $1 : 0 }
        glob("$stem*")
    )[0];

mkpath( [map {$stem . ($highest + $_*1000) } 1..10],
    1,    # verbose
    0777  # full access for everyone
);