(gawk.info) User-modified

 
 Built-in Variables that Control `awk'
 =====================================
 
    This is an alphabetical list of the variables which you can change to
 control how `awk' does certain things. Those variables that are
 specific to `gawk' are marked with an asterisk, `*'.
 
 `CONVFMT'
      This string controls conversion of numbers to strings (
      Conversion of Strings and Numbers Conversion.).  It works by
      being passed, in effect, as the first argument to the `sprintf'
      function ( Built-in Functions for String Manipulation String
      Functions.).  Its default value is `"%.6g"'.  `CONVFMT' was
      introduced by the POSIX standard.
 
 `FIELDWIDTHS *'
      This is a space separated list of columns that tells `gawk' how to
      split input with fixed, columnar boundaries.  It is an
      experimental feature.  Assigning to `FIELDWIDTHS' overrides the
      use of `FS' for field splitting.   Reading Fixed-width Data
      Constant Size, for more information.
 
      If `gawk' is in compatibility mode ( Command Line Options
      Options.), then `FIELDWIDTHS' has no special meaning, and field
      splitting operations are done based exclusively on the value of
      `FS'.
 
 `FS'
      `FS' is the input field separator ( Specifying How Fields are
      Separated Field Separators.).  The value is a single-character
      string or a multi-character regular expression that matches the
      separations between fields in an input record.  If the value is
      the null string (`""'), then each character in the record becomes
      a separate field.
 
      The default value is `" "', a string consisting of a single space.
      As a special exception, this value means that any sequence of
      spaces, tabs, and/or newlines is a single separator.(1)  It also
      causes spaces, tabs, and newlines at the beginning and end of a
      record to be ignored.
 
      You can set the value of `FS' on the command line using the `-F'
      option:
 
           awk -F, 'PROGRAM' INPUT-FILES
 
      If `gawk' is using `FIELDWIDTHS' for field-splitting, assigning a
      value to `FS' will cause `gawk' to return to the normal,
      `FS'-based, field splitting. An easy way to do this is to simply
      say `FS = FS', perhaps with an explanatory comment.
 
 `IGNORECASE *'
      If `IGNORECASE' is non-zero or non-null, then all string
      comparisons, and all regular expression matching are
      case-independent.  Thus, regexp matching with `~' and `!~', and
      the `gensub', `gsub', `index', `match', `split' and `sub'
      functions, record termination with `RS', and field splitting with
      `FS' all ignore case when doing their particular regexp operations.
      The value of `IGNORECASE' does _not_ affect array subscripting.
       Case-sensitivity in Matching Case-sensitivity.
 
      If `gawk' is in compatibility mode ( Command Line Options
      Options.), then `IGNORECASE' has no special meaning, and string
      and regexp operations are always case-sensitive.
 
 `OFMT'
      This string controls conversion of numbers to strings (
      Conversion of Strings and Numbers Conversion.) for printing with
      the `print' statement.  It works by being passed, in effect, as
      the first argument to the `sprintf' function ( Built-in
      Functions for String Manipulation String Functions.).  Its
      default value is `"%.6g"'.  Earlier versions of `awk' also used
      `OFMT' to specify the format for converting numbers to strings in
      general expressions; this is now done by `CONVFMT'.
 
 `OFS'
      This is the output field separator ( Output Separators).
      It is output between the fields output by a `print' statement.  Its
      default value is `" "', a string consisting of a single space.
 
 `ORS'
      This is the output record separator.  It is output at the end of
      every `print' statement.  Its default value is `"\n"'.  (
      Output Separators.)
 
 `RS'
      This is `awk''s input record separator.  Its default value is a
      string containing a single newline character, which means that an
      input record consists of a single line of text.  It can also be
      the null string, in which case records are separated by runs of
      blank lines, or a regexp, in which case records are separated by
      matches of the regexp in the input text.  ( How Input is
      Split into Records Records.)
 
 `SUBSEP'
      `SUBSEP' is the subscript separator.  It has the default value of
      `"\034"', and is used to separate the parts of the indices of a
      multi-dimensional array.  Thus, the expression `foo["A", "B"]'
      really accesses `foo["A\034B"]' ( Multi-dimensional Arrays
      Multi-dimensional.).
 
    ---------- Footnotes ----------
 
    (1) In POSIX `awk', newline does not count as whitespace.
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