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my $pid = open my $rdr, "$cmd |" or die "unable to run external comman
+d: $!";

...
}
close $rdr or die "reading from $rdr failed: $!";

my $pid = open my $rdr, '-|', $cmd, @args or die "unable to run extern
+al command: $!";

...
   ...
}
close $rdr or die "reading from $rdr failed: $!";