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I open a pipe to a program: 
open(PIPEWRITE, '|./program')
    or die "Can't start pipe: $!";
print PIPEWRITE for @array;
close PIPEWRITE 
    or die "Cant't close pipe: $!";

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But how do I read the output of my pipe? I dont want to store it to a file like this 
open(PIPEWRITE, '|./program > output');

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Because I am doing several thousand executions. How can I store the ouput to an array?

Solution:

use IPC::Open2;
my $pid = open2(\*RDRFH, \*WTRFH, './program');
print WTRFH @{$mail[0]};
close WTRFH;
waitpid $pid, 0;
my @array = <RDRFH>;
close RDRFH;

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http://www.perlmonks.org/index.pl?node_id=407972 would also work