#!/usr/bin/env perl

use strict;
use warnings;
use IPC::Run qw(run new_chunker);

my @cat = qw( cat );

run \@cat, '<pipe', \*PIPE, '>', new_chunker("\n"), sub {
    my $line = shift;
    print $line;
    push @out, $line;
  }, '2>', new_chunker("\n"), sub {
    my $line = shift;
    print STDERR $line;
    push @err, $line;
  } or die $?;

print PIPE "some input\n";
close PIPE;
print "out @out";
print "err @err";

__END__


karls-mac-mini:playground karl$ perl -c chunker.pl
Possible unintended interpolation of @out in string at chunker.pl line 21.
Possible unintended interpolation of @err in string at chunker.pl line 22.
Global symbol "@out" requires explicit package name (did you forget to declare "my @out"?) at chunker.pl line 12.
Global symbol "@err" requires explicit package name (did you forget to declare "my @err"?) at chunker.pl line 16.
Global symbol "@out" requires explicit package name (did you forget to declare "my @out"?) at chunker.pl line 21.
Global symbol "@err" requires explicit package name (did you forget to declare "my @err"?) at chunker.pl line 22.
chunker.pl had compilation errors.