You probably would be better off figuring out how to install
Parallel::ForkManager.
Here is the bare bones way to do it. You didn't say exactly what your problem was in the code.
#!/usr/bin/perl
use warnings;
use strict;
my %pids;
my @to_be_processed = (1..20);
my $cmd = 'echo';
foreach my $p (@to_be_processed){
$pids{$p}{'pid'} = open($pids{$p}{'fh'}, "$cmd $p 2>&1 |");
}
foreach my $key(keys %pids){
my $fh = $pids{$key}{'fh'};
while (<$fh>){
print $_;
#stuff data here into a return hash
}
}
foreach my $key(keys %pids){
waitpid($pids{$key}, 1);
}
print "done\n";
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