Another option, that is probably more efficient, is to take the code from prog2, and move it into a module, that can then be used from many programs:

You would create Code.pm:

sub GenOutput {
  my @inputs = @_;
  my $output = "blah";
  return $output;
}

1;
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Then, prog1 can do:

use Code;

...

$gimme = &GenOutput($var1, $var2);
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And prog2 is:

#!/usr/bin/perl
use Code;

&GenOutput;
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Does that make sense?