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  get my wish application to execute - I just get a wish prompt! Or I just get error msgs about permission denied, not found, etc.
 Most systems require a full pathname to the interpreter.  
So you cannot start a wish script out as 

#! wish -f

Likewise, many Unix systems have a maximum length of characters that you can
put on a #! line.  If you exceed this, you do not get the behaviour you
expect.  So do not try to put something like:

#! /projects/somethingbig/bin/sun4/wish -f

followed by your wish code.  Keep the lines short - under 32 characters is

Finally, on some machines, white space after the -f causes a problem.  Be
sure that the -f are the last characters on the first line of the file.