spawn example

var spawn = require('child_process').spawn,
    createSpawn = function(command) {
      var cmd = spawn(command, []);
      try {
        console.log('running command: ' + command);
        cmd.stdout.on('data', function(data){
          process.stdout.write(data);
        });
        cmd.stderr.on('data', function(data) {
          // process.stdout.write('ERROR:' + data);
          console.log('ERROR:' + data);
        });
        cmd.on('exit', function(code){
          if(code !== 0)
          process.stdout.write('process exited with code ' + code);
        });
      } catch(e) {
        console.log(e);
      }

    };

process.stdin.setEncoding('utf8');

process.stdin.on('readable', function() {
  var chunk = process.stdin.read();
  if (chunk !== null) {
    process.stdout.write('data: ' + chunk);
    console.log(typeof chunk);
    createSpawn(chunk.trim());
  }
});

process.stdin.on('end', function() {
  process.stdout.write('end');
});