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  1. or download this
      #foo() is the sub that outputs a lot of data
  my $pid = open(SUBOUT, '-|');
...
    $|=1; foo(); exit(0);
  }
  while (<SUBOUT>) ...
  2. or download this
    #!/usr/bin/perl -l
defined($tmp = open(FOO, '-|')) or die "Can't fork: $!";
...
}

print for map {chomp; "[$tmp] {$_}"} <FOO>;
  3. or download this
    $"=$,,$_=q>|\p4<6 8p<M/_|<('=>
.q>.<4-KI<l|2$<6%s!<qn#F<>;$,
.=pack'N*',"@{[unpack'C*',$_]
}"for split/</;$_=$,,y[A-Z a-z]
         {}cd;print lc