[OS X TeX] Forcing the use of pdtlatex or dvips

[Roberto Avanzi]

I remember reading times ago, maybe in this list, that there is a way  
to specify format and workflow in the first line of a file.  If it is  
processed by TeXShop, TeXShop will then call the appropriate  
programs, regardless of the default configuration of the program.   
Something like

%!Pdflatex

or similar in the first line of the input. However, I tried a few  
combinations. I know commands like

  %!TEX TS-program = xelatex

but not for avoiding to select the engine each time from a menu (and  
i do have to do that several times a day since texshop keeps crashing).

  best
   Roberto