Transform text in a file into another file, line by line. Handy for cleaning up CSV files. A node.js example.

tranform_a_text_file.js

var BufferedReader = require ("buffered-reader")
var BufferedWriter = require ("buffered-writer")
var $              = require ("jquery")

var targetFile = "target.txt"
var sourceFile = "source.txt"
var linesArray = []
var transform  = function (line) {
  // your transform here
  return line; 
}

new BufferedReader (sourceFile, { encoding: "utf8" })

  .on ("error", function (error){
    console.log ("error: " + error)
  })

  .on ("line", function (line){
    linesArray.push(line)
  })

  .on ("end", function (){

    var target = new BufferedWriter (targetFile)
     .on ("error", function (error){
        console.log (error)
      })

    $.each(linesArray, function(key, line) {
      line = transform(line)
      target.write (line + " \n")
    })

    target.close ()

  })
.read ()