var fs = require("fs");
var spawn = require("child_process").spawn;
fileName = process.argv[2];

if(!fileName)
{
  fileName = "fileio.js";

}

function watchCallback(fileName)
{
    let cmd = spawn("cmd.exe", ["/c", fileName]);
    cmd.stdout.pipe(process.stdout);
    console.log("file " + fileName + "just changed");
}

fs.watch(fileName, watchCallback(fileName));
console.log("watching for changes");