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11.4 Summary
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   * The programs provided in this major node continue on the theme that
     reading programs is an excellent way to learn Good Programming.

   * Using '#!' to make 'awk' programs directly runnable makes them
     easier to use.  Otherwise, invoke the program using 'awk -f ...'.

   * Reimplementing standard POSIX programs in 'awk' is a pleasant
     exercise; 'awk''s expressive power lets you write such programs in
     relatively few lines of code, yet they are functionally complete
     and usable.

   * One of standard 'awk''s weaknesses is working with individual
     characters.  The ability to use 'split()' with the empty string as
     the separator can considerably simplify such tasks.

   * The examples here demonstrate the usefulness of the library
     functions from *note Library Functions:: for a number of real (if
     small) programs.

   * Besides reinventing POSIX wheels, other programs solved a selection
     of interesting problems, such as finding duplicate words in text,
     printing mailing labels, and finding anagrams.