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gawk: OFMT

 
 5.4 Controlling Numeric Output with 'print'
 ===========================================
 
 When printing numeric values with the 'print' statement, 'awk'
 internally converts each number to a string of characters and prints
 that string.  'awk' uses the 'sprintf()' function to do this conversion
 (⇒String Functions).  For now, it suffices to say that the
 'sprintf()' function accepts a "format specification" that tells it how
 to format numbers (or strings), and that there are a number of different
 ways in which numbers can be formatted.  The different format
 specifications are discussed more fully in ⇒Control Letters.
 
    The predefined variable 'OFMT' contains the format specification that
 'print' uses with 'sprintf()' when it wants to convert a number to a
 string for printing.  The default value of 'OFMT' is '"%.6g"'.  The way
 'print' prints numbers can be changed by supplying a different format
 specification for the value of 'OFMT', as shown in the following
 example:
 
      $ awk 'BEGIN {
      >   OFMT = "%.0f"  # print numbers as integers (rounds)
      >   print 17.23, 17.54 }'
      -| 17 18
 
 According to the POSIX standard, 'awk''s behavior is undefined if 'OFMT'
 contains anything but a floating-point conversion specification.  (d.c.)
 
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