IsAstack ( )

[FlexibleLearning at aol.com]

I need a robust alternative to "if there is  a stack pFilePath" that does 
*not* load the file into memory and potentially  cause problems with shared stack 
name space.

Can anyone improve or see  anything not foolproof with this?

function isAstack  pFilePath
return line 1 of  url("file:"&pFilePath)="#!/bin/sh"
end isAstack  

/H