multijob.js

#!/usr/bin/env node

var exec = require('child_process').exec;

var jobs = [
  'sleep 1',
  'sleep 2',
  'sleep 3',
  'sleep 4',
  'false',
  'sleep 5',
  'sleep 6'
];
var remaining = jobs.length;

jobs.forEach(function(j, i) {
  exec(j, function(err) {
    console.log('job %d: %j\n   (%s)', i, err ? err : 'ok', j);
    remaining--;
    if (remaining === 0)
      process.exit(0);
  });
});

zzoutput.txt

leftwing@alpha ~ $ ./multijob.js 
job 4: {"killed":false,"code":1,"signal":null}
   (false)
job 0: "ok"
   (sleep 1)
job 1: "ok"
   (sleep 2)
job 2: "ok"
   (sleep 3)
job 3: "ok"
   (sleep 4)
job 5: "ok"
   (sleep 5)
job 6: "ok"
   (sleep 6)