From: arnold@skeeve.com   
      
   Tony Finch   wrote:   
   >The Unix shell is even more old-school. It works on the source   
   >directly, performing a series of substitutions and expansions to   
   >derive each command that is to be executed.   
      
   Not 100% true. The Bourne shell keeps a parse tree since there are   
   control structures - if, while, for, etc.   
   --   
   Aharon (Arnold) Robbins 				arnold AT skeeve DOT com   
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