Can you rephrase the question? i.e. "I want to check for matches in a file without using an 'open' on the file"..

Is something like

while(<STDIN>){
  print $_;
}
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<update>It also occurs to me that you might be asking "how do I grep a file that I don't have read-access to?" - in which case you are up the proverbial creek..</update>

map{$a=1-$_/10;map{$d=$a;$e=$b=$_/20-2;map{($d,$e)=(2*$d*$e+$a,$e**2
-$d**2+$b);$c=$d**2+$e**2>4?$d=8:_}1..50;print$c}0..59;print$/}0..20
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