in reply to Storing system results in an array

store to results of this action into an array

In addition to the good comments given above, IPC::Run3 is the answer to the literal question that you asked. It's also fairly portable, whereas the techniques in perlipc may not be. 

use strict;
use IPC::Run3;

my (@in, @out, @err);

run3( $your_command, \@in, \@out, \@err );

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-xdg

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