Your pseudo-code and your words tell me two different stories. First your pseudo-code (and without the die's): 
open INPUT from some_script;
read input
  if some_condition
      open >&INPUT from some_other_script
  do_something

[download]

While you say that you want INPUT from one script, and output from two scripts to one pipe. That means: 

open INPUT, "some_script |";
open OUTPUT, "| some_other_other_script ";
while (<INPUT>){
  if ($some_condition){
     open INPUT2, "some_other_script |";
     print OUTPUT $_ while <INPUT2>;
  }
  print OUTPUT $_;
}

[download]

Whatever the case, think of the two forms of pipe (input/output) and realize that ">&INPUT" is just an illegal name for a GLOB.

HTH,

Jeroen
"We are not alone"(FZ)

In reply to Re: Merging two pipes by jeroenes
in thread Merging two pipes by cmburns

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