Are you sure you really need to have the PID of child processes when using IPC::Run? It allows you to send signals and kill children directly. If you really must have the PID, it's possible to use start/pump/finish instead of run:

use strict;
use warnings;
use IPC::Run qw( start );

# Initiate the child process
my $data;
my $s = start [ 'ls' ], '>', \$data;

# Show its PID
for my $kid ( @{$s->{KIDS}} ) {
    print $kid->{PID};
}

# pump data in and out, then clean up
$s->pump;
$s->finish;

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In reply to Re: open3 but for n file descriptors by Loops
in thread open3 but for n file descriptors by tange

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