filter( input, options = Hash.new ) { |row| ... }
filter( input, output, options = Hash.new ) { |row| ... }
This method is a convenience for building Unix-like filters for CSV data. Each row is yielded to the provided block
which can alter it as needed. After the block returns, the row is appended
to output altered or not.
The input and output arguments can be anything ::new accepts (generally String or IO objects). If not given, they default to
ARGF and $stdout.
The options parameter is also filtered down to ::new after some clever key parsing. Any
key beginning with :in_ or :input_ will have that
leading identifier stripped and will only be used in the
options Hash for the
input object. Keys starting with :out_ or
:output_ affect only output. All other keys are
assigned to both objects.
The :output_row_sep option defaults to
$INPUT_RECORD_SEPARATOR ($/).
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