IsAstack ( )

[FlexibleLearning at aol.com]

Hi Klaus, Brian, David:

Good catches. I don't think I dare use  open/read/close in case the file (and 
it could be any file) is in use, and  testing the suffix is not always 
reliable (I am allowing data stacks to be  suffix-less). Since I've never used a 
shell script, I'm not sure what  differentiates them from a 'normal' stack in 
terms of initial stackfile  characters. I don't think there are any differences, 
so a bit hard to be 100%  foolproof it this case. Finally, since this is for 
ssBk and it is purposefully  always saved in 2.4 format (as several people have 
requested for project  compatibility purposes), I think I shall run with my 
original.
 
BUT your comments have been most instructive, and I thank you  all.

/H