head-tail stream adventure

/** First argument should be a filename, second head, third tail **/

var fs = require("fs");
var split = require("split");
var through = require("through");
var concat = require("concat-stream");

var filename = process.argv[2];
var head = Math.abs(process.argv[3] || 1);
var tail = Math.abs(process.argv[4] || 1);

var tailLimit = head - tail;

var headCounter = 1;
var tailCounter = 1;

var headlines = through(function (line) {
    if (headCounter > head) return;
    this.queue(line);
    headCounter++;
});

var tailLines = through(function (line) {
    if (tailLimit < tailCounter) {
        this.queue(line + "\n");
    }
    tailCounter++;
});

fs.createReadStream(filename)
    .pipe(split())
    .pipe(headlines)
    .pipe(tailLines)
    .pipe(concat(function (data) {
        console.log(data);
    }));