There are times when fixed-width data may be followed by additional data
that has no fixed length. Such data may or may not be present, but if
it is, it should be possible to get at it from an awk program.
Starting with version 4.2, in order to provide a way to say “anything
else in the record after the defined fields,” gawk
allows you to add a final ‘*’ character to the value of
FIELDWIDTHS. There can only be one such character, and it must
be the final non-whitespace character in FIELDWIDTHS.
For example:
$ cat fw.awk Show the program
-| BEGIN { FIELDWIDTHS = "2 2 *" }
-| { print NF, $1, $2, $3 }
$ cat fw.in Show sample input
-| 1234abcdefghi
$ gawk -f fw.awk fw.in Run the program
-| 3 12 34 abcdefghi