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Data Files for the Examples
===========================

   Many of the examples in this manual take their input from two sample
data files.  The first, called `BBS-list', represents a list of
computer bulletin board systems together with information about those
systems.  The second data file, called `inventory-shipped', contains
information about shipments on a monthly basis.  Each line of these
files is one "record".

   In the file `BBS-list', each record contains the name of a computer
bulletin board, its phone number, the board's baud rate, and a code for
the number of hours it is operational.  An `A' in the last column means
the board operates 24 hours a day.  A `B' in the last column means the
board operates evening and weekend hours, only.  A `C' means the board
operates only on weekends.

     aardvark     555-5553     1200/300          B
     alpo-net     555-3412     2400/1200/300     A
     barfly       555-7685     1200/300          A
     bites        555-1675     2400/1200/300     A
     camelot      555-0542     300               C
     core         555-2912     1200/300          C
     fooey        555-1234     2400/1200/300     B
     foot         555-6699     1200/300          B
     macfoo       555-6480     1200/300          A
     sdace        555-3430     2400/1200/300     A
     sabafoo      555-2127     1200/300          C

   The second data file, called `inventory-shipped', represents
information about shipments during the year.  Each record contains the
month of the year, the number of green crates shipped, the number of
red boxes shipped, the number of orange bags shipped, and the number of
blue packages shipped, respectively.  There are 16 entries, covering
the 12 months of one year and 4 months of the next year.

     Jan  13  25  15 115
     Feb  15  32  24 226
     Mar  15  24  34 228
     Apr  31  52  63 420
     May  16  34  29 208
     Jun  31  42  75 492
     Jul  24  34  67 436
     Aug  15  34  47 316
     Sep  13  55  37 277
     Oct  29  54  68 525
     Nov  20  87  82 577
     Dec  17  35  61 401
     
     Jan  21  36  64 620
     Feb  26  58  80 652
     Mar  24  75  70 495
     Apr  21  70  74 514

   If you are reading this in GNU Emacs using Info, you can copy the
regions of text showing these sample files into your own test files.
This way you can try out the examples shown in the remainder of this
document.  You do this by using the command `M-x write-region' to copy
text from the Info file into a file for use with `awk' 
((emacs)Misc File Ops, for more information).  Using this
information, create your own `BBS-list' and `inventory-shipped' files,
and practice what you learn in this manual.