Use reference as the filename: 
$query =  `netstat -ntu | awk '{print \$4}' | sort -nr`;
open my $FH, '<', \$query;
while (<$FH>) {
    ...
}

[download]
Also, consider doing the awk's work and sorting in Perl, too.

In reply to Re: simple question about printing vars by choroba
in thread simple question about printing vars by httpd

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