http://www.perlmonks.org?node_id=523053


in reply to Parallel::ForkManager and system "command",@args;

instead of Parallel::ForkManager you can use Proc::Queue: 
use Proc::Queue size => 5, qw(system_back);

for my $args (@args) {
  system_back $cmd, @{$args};
}

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In Section Seekers of Perl Wisdom