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gawk: Long

 1.1.3 Running Long Programs
 Sometimes 'awk' programs are very long.  In these cases, it is more
 convenient to put the program into a separate file.  In order to tell
 'awk' to use that file for its program, you type:
    The '-f' instructs the 'awk' utility to get the 'awk' program from
 the file SOURCE-FILE (⇒Options).  Any file name can be used for
 SOURCE-FILE.  For example, you could put the program:
      BEGIN { print "Don't Panic!" }
 into the file 'advice'.  Then this command:
      awk -f advice
 does the same thing as this one:
      awk 'BEGIN { print "Don\47t Panic!" }'
 This was explained earlier (⇒Read Terminal).  Note that you don't
 usually need single quotes around the file name that you specify with
 '-f', because most file names don't contain any of the shell's special
 characters.  Notice that in 'advice', the 'awk' program did not have
 single quotes around it.  The quotes are only needed for programs that
 are provided on the 'awk' command line.  (Also, placing the program in a
 file allows us to use a literal single quote in the program text,
 instead of the magic '\47'.)
    If you want to clearly identify an 'awk' program file as such, you
 can add the extension '.awk' to the file name.  This doesn't affect the
 execution of the 'awk' program but it does make "housekeeping" easier.
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