Thank you for that.  With a little tweaking it's doing exactly what I wanted (in combination with watch).  I reversed the sort order (highest open file count first).  And as previously mentioned RH9's lsof doesn't support +c 16.  It doesn't print any output if you try and use that option. 

Regards

Ok, you asked for it...

(PS I think this looks a lot more readable than Perry's
awk/uniq/sort/join/ps/sort/sort command-line monstrosity...)

  The PowerPC chip has a machine instruction for Ensure Inline Execution of
  I/O. The opcode is EIEIO. And you thought engineers had no sense of humour?

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